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Mercury 300 Hour Service Kits | Pro Marine USA
Shop Mercury 300 hour service kits for complete scheduled outboard maintenance. These kits help simplify major service intervals by grouping many of the maintenance parts commonly replaced during Mercury factory-recommended service schedules.
Always confirm your Mercury horsepower, engine family, and serial number before ordering a 300 hour service kit.
Shop Mercury 300 Hour Service Kit Categories
- Mercury 40-60hp EFI 300 Hour Kit
- Mercury 75-115hp EFI 4 Stroke 300 Hour Kit
- Mercury L4 Verado 300 Hour Kit
- Mercury V4 150hp 4 Stroke EFI 300 Hour Kit
- Mercury V6 175-225 4 Stroke 300 Hour Kit
- Mercury L6 Verado 300 Hour Kit
- Mercury V8 225-300hp 4 Stroke 300 Hour Kit
- Mercury V8 4.6L 450R-500R 300 Hour Kit
- Mercury V10 350-425 300 Hour Kit
What Is Included In A Mercury 300 Hour Service Kit?
Mercury 300 hour service kits are typically more comprehensive than routine 100 hour maintenance kits. While contents vary by engine family, many kits are designed to cover a large portion of the components commonly replaced during a major scheduled service interval.
- Oil filters and fuel filters
- Engine oil and gear lube when included
- Spark plugs
- Thermostats and thermostat seals
- Engine anodes
- Water pump kits and impellers
- Drive belts on applicable models
- Drain gaskets, O-rings, seals, and service hardware
Tip: Not every Mercury engine uses the same maintenance components. Always verify your model and serial number and review individual kit contents before ordering.
Why Perform A Mercury 300 Hour Service?
A Mercury 300 hour service helps maintain cooling system performance, fuel efficiency, corrosion protection, and overall engine reliability. Replacing wear items such as thermostats, spark plugs, water pump components, and anodes at scheduled intervals can help reduce unexpected downtime and extend engine life.
For many boat owners, the 300 hour service is one of the most important maintenance intervals because it addresses components that experience normal wear over time but are not typically replaced during annual oil service.
100 Hour vs 300 Hour Mercury Service
A Mercury 100 hour service is generally focused on routine maintenance such as oil changes, fuel filters, and basic service items. A Mercury 300 hour service is usually more extensive and may include ignition, cooling system, water pump, thermostat, belt, and corrosion protection components depending on the engine family.
Frequently Asked Questions
What is included in a Mercury 300 hour service kit?
Many Mercury 300 hour service kits include filters, spark plugs, thermostats, anodes, water pump components, seals, gaskets, and related maintenance parts. Some kits also include engine oil and gear lube.
How is a Mercury 300 hour service different from a 100 hour service?
A 100 hour service usually focuses on routine oil and filter maintenance. A 300 hour service typically includes additional cooling system, ignition system, and corrosion protection components.
Do Mercury 300 hour service kits include water pump parts?
Many Mercury 300 hour kits include water pump service components, although contents vary by application. Review the individual kit listing for exact details.
Do Mercury 300 hour service kits include oil and gear lube?
Some kits include engine oil and lower unit gear lube while others do not. Check the individual product description for complete kit contents.
How do I choose the correct Mercury 300 hour service kit?
Use your Mercury horsepower, engine family, and serial number to identify the correct service kit. Similar horsepower engines may use different maintenance parts.
Helpful Links
Mercury Racing 500R 300 Hour Service Kit
Mercury 500R V8 4.6L 300 Hour Maintenance Kit
The MER500R-300 300 Hour Service Kit is designed for Mercury Racing 500R 4.6L V8 outboards. This kit is built for scheduled 300 hour maintenance and includes the major service items needed for the Mercury 500R service interval.
This version does not include engine oil or gear lube. Some customers prefer this kit because they want to choose their own recommended oil option or already have Mercury oil and gear lube on hand.
Compatible Applications
| Brand | Engine | Displacement | Service Interval |
|---|---|---|---|
| Mercury Racing | 500R V8 FourStroke | 4.6L | 300 Hour Maintenance |
This MER500R-300 kit is the 300 hour service kit with engine oil and gear lube sold separately.
For the complete 300 hour version with Mercury 10W30 Full Synthetic oil and Mercury Extreme Performance 85W90 gear lube included, use the MER500R-300L 300 Hour Kit With Oil & Gear Lube.
What is Included
| Qty | Part | Description |
|---|---|---|
| 1 | 8M0123025 | OEM Mercury Oil Filter |
| 2 | 8M0204693 | Lower Unit Drain Plug Seals |
| 1 | 8M0166596 | OEM Mercury Fuel Filter |
| 1 | 8M0210477 | Thermostat Assembly |
| 8 | LKAR7C-9 | NGK Spark Plugs |
| 1 | 8M0200136 | Water Pump Impeller Repair Kit |
| 1 | 8M0210486 | Supercharger Belt |
| 1 | 8M0142251 | Serpentine Belt |
| 1 | 8M0137814 | Lower Unit Aluminum Anode |
Recommended Engine Oil
Mercury Racing 500R engines use approximately 7 quarts of engine oil, or 2 gallons.
Mercury recommends Mercury 10W30 Full Synthetic Oil. Mercury also recommends Mercury 10W30 MRX Racing Oil for customers who prefer MRX race oil.
This kit does not include engine oil.
| Oil Type | Product | Quantity Required |
|---|---|---|
| Mercury 10W30 Full Synthetic | Mercury 10W30 Full Synthetic - Gallon | 2 gallons / approximately 7 quarts |
| Mercury 10W30 Full Synthetic | Mercury 10W30 Full Synthetic - Quart | 7 quarts |
| Mercury 10W30 MRX Racing Oil | Mercury 10W30 MRX Racing Oil - Gallon | 2 gallons / approximately 7 quarts |
Recommended Gear Lube
Mercury Racing 500R lower units use approximately 1 quart of gear lube.
This kit does not include gear lube.
| Gear Lube | Product | Quantity Required |
|---|---|---|
| Mercury Extreme Performance Gear Lube 85W90 | Mercury Extreme Performance Gear Lube 85W90 | 1 quart |
Want the Complete 300 Hour Kit With Oil & Gear Lube?
500R 300 Hour Kit With Oil & Gear Lube
The MER500R-300L kit includes the 300 hour service kit plus Mercury 10W30 Full Synthetic engine oil and Mercury Extreme Performance 85W90 gear lube.
View Kit With Oil & Gear LubeRelated 500R Service Kits
500R 300 Hour Kit With Oil & Gear Lube
Complete 300 hour maintenance kit for Mercury Racing 500R outboards with oil and gear lube included.
View Product
500R 100 Hour Service Kit
Mercury Racing 500R 100 hour service kit. Oil and gear lube sold separately.
View Product
500R 100 Hour Kit With Oil & Gear Lube
Complete 100 hour maintenance kit with Mercury 10W30 Full Synthetic oil and Extreme Performance 85W90 gear lube.
View Product500R Anodes & Corrosion Protection
What This Service Kit is Used For
The MER500R-300 service kit is used for scheduled 300 hour maintenance on Mercury Racing 500R 4.6L V8 outboards.
This kit is ideal for customers who want the core 300 hour service kit but prefer to order engine oil and gear lube separately.
Key Features and Benefits
- Designed for Mercury Racing 500R V8 4.6L outboards
- Built for scheduled 300 hour maintenance
- Oil and gear lube sold separately
- Allows customers to choose Mercury 10W30 Full Synthetic or 10W30 MRX Racing Oil
- Pairs with Mercury Extreme Performance 85W90 gear lube
- Complete MER500R-300L version with oil and gear lube linked above
- Includes links to related 500R service kits and anodes
Service Kit Details
- Part Number: MER500R-300
- Related Kit With Oil & Gear Lube: MER500R-300L
- Application: Mercury Racing 500R
- Engine: V8 4.6L FourStroke
- Service Interval: 300 Hour Maintenance
- Oil Included: No
- Gear Lube Included: No
- Recommended Oil Capacity: 7 quarts / 2 gallons
- Recommended Gear Lube Capacity: 1 quart
FAQ
What engine does this kit fit?
This kit fits Mercury Racing 500R 4.6L V8 outboards.
Does this kit include engine oil?
No. Engine oil is sold separately with this version.
Does this kit include gear lube?
No. Gear lube is sold separately with this version.
Is there a version with oil and gear lube included?
Yes. The MER500R-300L kit with Mercury 10W30 Full Synthetic oil and
Mercury Extreme Performance 85W90 gear lube is linked above.
What oil is recommended for the Mercury 500R?
Mercury recommends 10W30 Full Synthetic oil. Mercury 10W30 MRX Racing Oil
is also a recommended option for customers who prefer MRX race oil.
How much gear lube does the 500R use?
The Mercury Racing 500R lower unit uses approximately 1 quart of
Mercury Extreme Performance 85W90 gear lube.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil and lubricants may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
MER500R-300, MER500R-300L, Mercury 500R 300 hour service kit, Mercury Racing 500R 300 hour kit, Mercury 500R maintenance kit, Mercury 500R oil sold separately, Mercury 500R gear lube sold separately, Mercury 500R 4.6L V8 service, Mercury 10W30 Full Synthetic, Mercury 10W30 MRX Racing Oil, Mercury Extreme Performance Gear Lube 85W90, 8M0173224, 8M0173223, 8M0169265, 8M0111677, 8M0218976, 8M0204939, 38021, 8M0137814
Mercury L6 Verado 300 Hour Service Kit
Mercury Inline 6 Verado 350HP-400HP 300 Hour Service Kit
This VER100-L6350 300 hour service kit is built for Mercury Inline 6 Verado 350HP-400HP outboards. It is designed for major scheduled maintenance on compatible high horsepower L6 Verado FourStroke models.
This kit is a convenient option for customers performing 300 hour service and wanting the major maintenance components grouped together for their compatible Mercury L6 Verado 350HP or 400HP outboard.
Compatible Applications
| Brand | Horsepower | Engine Type | Application Notes |
|---|---|---|---|
| Mercury | 350HP | L6 Verado FourStroke | Compatible high horsepower L6 Verado models |
| Mercury | 400HP | L6 Verado FourStroke | Compatible high horsepower L6 Verado models |
This 300 hour service kit is intended for Mercury Inline 6 Verado 350HP-400HP outboards.
If you have a 200HP-300HP L6 Verado, use one of the 200HP-300HP 300 hour service kit options linked below.
Have a 200HP-300HP L6 Verado?
Mercury L6 Verado 200HP-300HP 300 Hour Kit
300 hour service kit for Mercury Inline 6 Verado 200HP-300HP models with the later 2B serial range.
View Product
Mercury L6 Verado 200HP-300HP Service Kit
Service kit option for earlier Mercury Inline 6 Verado 200HP-300HP models with serial numbers 2B144122 and below.
View ProductWhat is Included
| Included Component | Application |
|---|---|
| 300 hour maintenance components | Major scheduled service interval |
| Oil filter service component | Engine oil filtration service |
| Fuel filter service components | Fuel system maintenance |
| Spark plug service components | Ignition system maintenance |
| Water pump / cooling system service components | Cooling system and water pump maintenance |
| Anode / corrosion protection components | Routine corrosion protection maintenance |
| Service seals and maintenance hardware | Routine replacement during scheduled service |
What This Service Kit is Used For
This VER100-L6350 service kit is used for 300 hour scheduled maintenance on compatible Mercury Inline 6 Verado 350HP-400HP FourStroke outboards.
300 hour service is a major maintenance interval that helps support fuel system cleanliness, ignition performance, cooling system operation, corrosion protection, and long-term engine reliability.
Regular scheduled maintenance helps support dependable Verado performance, proper cooling, clean fuel delivery, and long-term durability in demanding marine conditions.
Customers with 200HP-300HP L6 Verado models should use one of the linked service kit options above instead of this 350HP-400HP kit.
Key Features and Benefits
- 300 hour service kit for Mercury Inline 6 Verado outboards
- Fits Mercury L6 Verado 350HP-400HP models
- Designed for major scheduled maintenance
- Supports fuel system, ignition, cooling system, and corrosion protection service
- Convenient way to group major maintenance components
- Helps support long-term Verado reliability and performance
- Use 200HP-300HP kit options for lower horsepower L6 Verado models
Service Kit Details
- Kit Part Number: VER100-L6350
- Application: Mercury Inline 6 Verado FourStroke Outboards
- Horsepower Range: 350HP-400HP
- Service Interval: 300 Hour Maintenance
- Engine Family: L6 Verado
- Service Type: Major scheduled maintenance
FAQ
What engines does this 300 hour service kit fit?
This kit fits compatible Mercury Inline 6 Verado 350HP-400HP outboards.
Does this kit fit Mercury L6 Verado 200HP-300HP models?
No. Mercury L6 Verado 200HP-300HP models use different service kit options, linked above.
Is this the same as a basic oil change kit?
No. This is a 300 hour service kit. A basic oil change kit is used for engine oil and oil filter service only.
What is the difference between 100 hour and 300 hour service?
A 100 hour service is a routine maintenance interval, while 300 hour service is a larger scheduled service that may include additional maintenance items depending on the engine and service schedule.
Should I verify fitment before ordering?
Yes. Always confirm your engine horsepower, model, and service requirements before ordering maintenance parts.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil, lubricants, installed parts, and used maintenance items may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
VER100-L6350, Mercury L6 Verado 350HP 300 hour service kit, Mercury L6 Verado 400HP 300 hour service kit, Mercury Inline 6 Verado 350HP service kit, Mercury Inline 6 Verado 400HP service kit, Mercury Verado 300 hour maintenance kit, Mercury L6 Verado 300 hour kit, Mercury high horsepower Verado service kit, VER100-L62B, VER100-L6, Mercury 200HP Verado 300 hour kit, Mercury 300HP Verado 300 hour kit
Mercury Racing 500R 300 Hour Service Kit With Oil & Gear Lube
Mercury 500R V8 4.6L 300 Hour Maintenance Kit With Oil
The MER500R-300L 300 Hour Service Kit is designed for Mercury Racing 500R 4.6L V8 outboards. This complete maintenance package includes the major Mercury 500R 300 hour service components plus Mercury 10W30 Full Synthetic engine oil and Mercury Extreme Performance 85W90 gear lube.
This complete version is ideal for customers who want the filters, thermostat, belts, impeller kit, spark plugs, engine oil, and gear lube needed for a Mercury Racing 500R 300 hour service in one package.
Compatible Applications
| Brand | Engine | Displacement | Service Interval |
|---|---|---|---|
| Mercury Racing | 500R V8 FourStroke | 4.6L | 300 Hour Maintenance |
This kit includes Mercury 10W30 Full Synthetic engine oil and Mercury Extreme Performance 85W90 gear lube.
Mercury recommends Mercury 10W30 Full Synthetic Oil , which is included in this kit.
Mercury also recommends Mercury 10W30 MRX Racing Oil for customers who prefer MRX race oil.
Want to Use a Different Oil?
500R 300 Hour Kit Without Oil & Gear Lube
Some customers prefer to order a different recommended oil option, such as Mercury 10W30 MRX Racing Oil, or already have engine oil and gear lube on hand. The MER500R-300 kit is available without engine oil and gear lube.
View Kit Without Oil & Gear LubeWhat is Included
| Qty | Part | Description |
|---|---|---|
| 1 | 8M0123025 | OEM Mercury Oil Filter |
| 2 | 8M0204693 | Lower Unit Drain Plug Seals |
| 1 | 8M0166596 | OEM Mercury Fuel Filter |
| 1 | 8M0210477 | Thermostat Assembly |
| 8 | LKAR7C-9 | NGK Spark Plugs |
| 1 | 8M0200136 | Water Pump Impeller Repair Kit |
| 1 | 8M0210486 | Supercharger Belt |
| 1 | 8M0142251 | Serpentine Belt |
| 1 | 8M0137814 | Lower Unit Aluminum Anode |
| 2 Gallons | 8M0173224 | Mercury 10W30 Full Synthetic Marine Engine Oil |
| 1 Quart | 8M0111677 | Mercury Extreme Performance Gear Lube 85W90 |
500R Anodes & Corrosion Protection
What This Service Kit is Used For
The MER500R-300L service kit is used for complete scheduled 300 hour maintenance on Mercury Racing 500R 4.6L V8 outboards.
This complete maintenance package supports oil filtration, fuel filtration, thermostat replacement, water pump service, spark plug replacement, supercharger and serpentine belt replacement, lower unit anode replacement, engine oil service, and gearcase lubricant service.
Key Features and Benefits
- Designed for Mercury Racing 500R V8 4.6L outboards
- Complete 300 hour maintenance package
- Includes Mercury 10W30 Full Synthetic engine oil
- Includes Mercury Extreme Performance 85W90 gear lube
- Includes OEM Mercury filters, thermostat, belts, and impeller kit
- Includes NGK spark plugs and lower unit anode
- Links to related 500R anodes and maintenance parts
- Supports scheduled Mercury Racing maintenance intervals
Service Kit Details
- Part Number: MER500R-300L
- Related Kit Without Oil: MER500R-300
- Application: Mercury Racing 500R
- Engine: V8 4.6L FourStroke
- Service Interval: 300 Hour Maintenance
- Oil Included: Yes - Mercury 10W30 Full Synthetic
- Oil Quantity Included: 2 gallons
- Gear Lube Included: Yes - Mercury Extreme Performance 85W90
- Gear Lube Quantity Included: 1 quart
FAQ
What engine does this kit fit?
This kit fits Mercury Racing 500R 4.6L V8 outboards.
Does this kit include engine oil?
Yes. This version includes Mercury 10W30 Full Synthetic engine oil.
Does this kit include gear lube?
Yes. This kit includes Mercury Extreme Performance 85W90 gear lube.
What other oil does Mercury recommend?
Mercury also recommends Mercury 10W30 MRX Racing Oil for customers who prefer MRX race oil.
Is there a version without oil and gear lube?
Yes. The MER500R-300 kit without oil and gear lube is linked above.
Does this kit include the 500R service belts and thermostat?
Yes. This kit includes the thermostat, supercharger belt, serpentine belt,
water pump impeller repair kit, spark plugs, filters, and lower unit anode.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil and lubricants may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
MER500R-300L, MER500R-300, Mercury 500R 300 hour service kit, Mercury Racing 500R 300 hour kit, Mercury 500R oil change kit, Mercury 500R thermostat kit, Mercury 500R impeller kit, Mercury 500R spark plugs, Mercury 500R supercharger belt, Mercury 500R serpentine belt, Mercury 10W30 Full Synthetic, Mercury 10W30 MRX Racing Oil, Mercury Extreme Performance Gear Lube 85W90, 8M0123025, 8M0204693, 8M0166596, 8M0210477, LKAR7C-9, 8M0200136, 8M0210486, 8M0142251, 8M0137814, 8M0173224, 8M0111677
Mercury L6 Verado 300 Hour Service Kit
Mercury Inline 6 Verado 200HP-300HP 300 Hour Service Kit
This VER100-L62B 300 hour service kit is built for Mercury Inline 6 Verado 200HP-300HP outboards with serial numbers 2B144122 and newer. It is designed for major scheduled maintenance on compatible L6 Verado FourStroke models.
This kit is a convenient option for customers performing 300 hour service and wanting the major maintenance components grouped together for their compatible Mercury L6 Verado outboard.
Compatible Applications
| Brand | Horsepower | Engine Type | Serial Range |
|---|---|---|---|
| Mercury | 200HP | L6 Verado FourStroke | 2B144122-Present |
| Mercury | 225HP | L6 Verado FourStroke | 2B144122-Present |
| Mercury | 250HP | L6 Verado FourStroke | 2B144122-Present |
| Mercury | 300HP | L6 Verado FourStroke | 2B144122-Present |
This VER100-L62B kit is for Mercury L6 Verado 200HP-300HP models. If you have a 350HP-400HP L6 Verado, order the kit below.
Mercury L6 Verado 350HP-400HP 300 Hour Kit
300 hour service kit for Mercury L6 Verado 350HP-400HP models. Use this option for the higher horsepower L6 Verado applications.
View ProductThis 300 hour service kit is intended for Mercury Inline 6 Verado 200HP-300HP outboards with serial numbers 2B144122 and newer.
Always verify your engine model, horsepower, and serial number before ordering.
What is Included
| Included Component | Application |
|---|---|
| 300 hour maintenance components | Major scheduled service interval |
| Oil filter service component | Engine oil filtration service |
| Fuel filter service components | Fuel system maintenance |
| Spark plug service components | Ignition system maintenance |
| Water pump / cooling system service components | Cooling system and water pump maintenance |
| Anode / corrosion protection components | Routine corrosion protection maintenance |
| Service seals and maintenance hardware | Routine replacement during scheduled service |
Complete Your Service
Mercury L6 Verado Oil Change Kit
Mercury 25W50 oil change kit for select L6 Verado outboards. Includes two gallons of oil, oil filter, and drain seal.
View Product
100 Hour Kit Without Oil
OEM Mercury 100 hour service kit for L6 Verado models with later serial numbers. Oil and gear lube are sold separately.
View Product
100 Hour Kit With Oil
OEM Mercury 100 hour service kit with oil for L6 Verado models with later serial numbers.
View ProductWhat This Service Kit is Used For
This VER100-L62B service kit is used for 300 hour scheduled maintenance on compatible Mercury Inline 6 Verado 200HP-300HP FourStroke outboards.
300 hour service is a more complete maintenance interval than a basic oil change and typically addresses major service areas such as ignition, fuel filtration, cooling system service, corrosion protection, and routine replacement seals or hardware.
Regular scheduled maintenance helps support long-term Verado reliability, clean fuel delivery, proper engine cooling, corrosion protection, and dependable performance on the water.
Customers performing only engine oil service can use the linked Mercury L6 Verado oil change kit. Customers performing annual or 100 hour service can use the linked 100 hour kit with or without oil.
Key Features and Benefits
- 300 hour service kit for Mercury Inline 6 Verado outboards
- Fits Mercury L6 Verado 200HP-300HP models
- For serial numbers 2B144122-Present
- Designed for major scheduled maintenance
- Supports fuel system, ignition, cooling system, and corrosion protection service
- Convenient way to group major maintenance components
- Pairs with Mercury L6 oil change and 100 hour service kits
Service Kit Details
- Kit Part Number: VER100-L62B
- Application: Mercury Inline 6 Verado FourStroke Outboards
- Horsepower Range: 200HP-300HP
- Serial Range: 2B144122-Present
- Service Interval: 300 Hour Maintenance
- Engine Family: L6 Verado
- Service Type: Major scheduled maintenance
FAQ
What engines does this 300 hour service kit fit?
This kit fits Mercury Inline 6 Verado 200HP-300HP outboards with serial numbers 2B144122 and newer.
Does this kit fit 350HP-400HP L6 Verado models?
No. Mercury L6 Verado 350HP-400HP models use a different 300 hour service kit, linked above.
Is this the same as a basic oil change kit?
No. This is a 300 hour service kit. A basic oil change kit is used for engine oil and oil filter service only.
Do you offer a Mercury L6 Verado oil change kit?
Yes. The Mercury L6 Verado 25W50 oil change kit is linked above in the Complete Your Service section.
Do you offer 100 hour kits for this engine family?
Yes. The 100 hour kit without oil and 100 hour kit with oil are both linked above.
Should I verify my serial number?
Yes. Mercury L6 Verado service kits can vary by serial number range, so always confirm your serial number before ordering.
What is the difference between 100 hour and 300 hour service?
A 100 hour service is a routine maintenance interval, while 300 hour service is a larger scheduled service that may include additional maintenance items depending on the engine and service schedule.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil, lubricants, installed parts, and used maintenance items may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
VER100-L62B, Mercury L6 Verado 300 hour service kit, Mercury Inline 6 Verado 300 hour kit, Mercury Verado 300 hour maintenance kit, Mercury L6 Verado 200HP service kit, Mercury L6 Verado 225HP service kit, Mercury L6 Verado 250HP service kit, Mercury L6 Verado 300HP service kit, Mercury Verado 2B144122 and newer, Mercury 100 hour service kit, Mercury L6 Verado oil change kit, OCKIT-1, 8M0120657, 8M0120657-L, VER100-L6350, Mercury L6 Verado 350HP 300 hour kit, Mercury L6 Verado 400HP 300 hour kit
OEM Mercury 300-Hour V6 Service Kit with Oil & Gear Lube
Mercury 8M0149930-L Service Kit for 3.4L V6 FourStroke Outboards
The Mercury 8M0149930-L 300-Hour Service Kit is designed for Mercury 3.4L V6 FourStroke outboards.
This OEM Mercury maintenance package includes the major 300-hour service replacement components along with Mercury 10W30 engine oil and Mercury gear lube for a more complete service package.
Compatible Applications
| Engine Family | Engine Size | Engine Type | Application Notes |
|---|---|---|---|
| Mercury FourStroke | 3.4L V6 | FourStroke Outboards | Fits compatible Mercury 3.4L V6 FourStroke outboards |
Always verify your exact engine model and serial number before ordering maintenance kits or replacement service parts.
What is Included
- OEM Mercury oil filter
- OEM Mercury fuel filter
- Oil drain seal
- Spark plugs
- Thermostat
- Alternator belt
- Anodes
- Water pump repair kit
- Mercury 10W30 engine oil
- Mercury gear lube
OEM Part Numbers & Cross References
| Brand / Type | Part Number |
|---|---|
| Mercury OEM | 8M0149930-L |
| Related Kit Without Oil | 8M0149930 |
| Application | 300-Hour V6 Service Kit with Oil & Gear Lube |
Prefer a Different Oil Weight?
This version includes Mercury 10W30 engine oil and Mercury gear lube.
Some customers prefer ordering their service kit without oil so they can choose a different Mercury oil weight or oil type.
If you would rather choose your own oil separately, see:
Related Anode Kit
Mercury 3.4L V6 FourStroke outboards use the Mercury aluminum anode kit shown below.
For replacement aluminum anodes, see:
Mercury 8M0205955 Aluminum Anode Kit
What This Service Kit is Used For
This Mercury 300-hour maintenance kit is designed for scheduled service on compatible Mercury 3.4L V6 FourStroke outboards.
Regular maintenance helps support long-term reliability, cooling system performance, fuel system operation, and corrosion protection.
Mercury packages the required 300-hour service components together to simplify maintenance and reduce the need to source parts individually.
Key Features and Benefits
- Genuine OEM Mercury 300-hour maintenance kit
- Fits Mercury 3.4L V6 FourStroke outboards
- Includes oil filter, fuel filter, and oil drain seal
- Includes spark plugs, thermostat, alternator belt, and water pump repair kit
- Includes aluminum anodes
- Includes Mercury 10W30 engine oil and gear lube
- Convenient all-in-one maintenance package
- Produced to Mercury OEM specifications
Service Kit Details
- Brand: Mercury / Quicksilver
- Part Number: 8M0149930-L
- Part Type: 300-Hour Service Kit with Oil & Gear Lube
- Application: Mercury 3.4L V6 FourStroke Outboards
- Includes Oil: Yes
- Includes Gear Lube: Yes
- Quantity Sold: Kit
FAQ
What engines does Mercury 8M0149930-L fit?
This kit fits Mercury 3.4L V6 FourStroke outboards.
Does this kit include engine oil?
Yes. This version includes Mercury 10W30 engine oil.
Does this kit include gear lube?
Yes. Mercury gear lube is included.
What parts are included in this 300-hour service kit?
The kit includes an oil filter, fuel filter, oil drain seal,
spark plugs, thermostat, alternator belt, water pump repair kit,
anodes, engine oil, and gear lube.
Which anode kit goes with this engine?
This application uses Mercury aluminum anode kit 8M0205955.
Is there a version without oil and gear lube?
Yes. Mercury 8M0149930 includes the same 300-hour maintenance parts
without engine oil and gear lube.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Service kits should be verified for correct fitment before installation.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0149930-L, Mercury V6 300 hour service kit, Mercury 3.4L V6 maintenance kit, Mercury FourStroke maintenance kit, Mercury spark plug service kit, Mercury thermostat service kit, Mercury water pump repair kit, Mercury alternator belt kit, Mercury anode service kit, Mercury oil filter fuel filter kit, Mercury 10W30 oil kit, Mercury gear lube kit, 8M0149930, 8M0205955
OEM Mercury 40-60HP 300 Hour Service Kit With Oil
Mercury 40-60HP 300 Hour Kit Standard Gearcase
The Mercury 8M0113483-L 300 Hour Service Kit is a complete maintenance package for Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards with serial numbers 1C000001 and higher equipped with standard gearcases.
This 300 hour maintenance kit includes the required service components along with Mercury 10W30 engine oil and gear lube for scheduled maintenance service.
Compatible Applications
| Brand | Horsepower | Engine Type | Gearcase Type | Serial Range |
|---|---|---|---|---|
| Mercury | 40HP | FourStroke EFI Outboard | Standard Gearcase | 1C000001 & Higher |
| Mercury | 50HP | FourStroke EFI Outboard | Standard Gearcase | 1C000001 & Higher |
| Mercury | 60HP | FourStroke EFI Outboard | Standard Gearcase | 1C000001 & Higher |
This Mercury 300 hour service kit fits Mercury 40-60HP FourStroke EFI outboards with serial numbers 1C000001 and higher equipped with standard gearcases only.
If your engine has a BigFoot or Command Thrust gearcase, use the BigFoot / Command Thrust kits linked below instead.
What is Included
| Included Component | Application |
|---|---|
| Oil Filter | Engine oil filtration service |
| Fuel Filters | Fuel system maintenance |
| Spark Plugs | Ignition system maintenance |
| Water Pump Components | Cooling system service |
| Thermostat Components | Cooling system maintenance |
| Drain & Vent Seals | Gearcase service |
| Mercury 10W30 Engine Oil | Engine oil service |
| Mercury Gear Lube | Gearcase lubricant service |
Prefer to Choose a Different Oil?
Some customers prefer to purchase a different Mercury oil, including Mercury 25W40, Synthetic Blend, or Full Synthetic options.
If you prefer to choose your own engine oil and gear lube, order the standard 300 hour kit below.
Order 8M0113483 - Oil and Gear Lube Sold SeparatelyIncluded Oil & Gear Lube Information
This kit includes Mercury 10W30 engine oil and gear lube for the complete 300 hour maintenance service.
Mercury 40-60HP FourStroke EFI engines use approximately 4 quarts of engine oil, or 1 gallon.
Standard gearcase applications use approximately 1 quart of gear lube.
BigFoot / Command Thrust 300 Hour Kits
300 Hour Kit - BigFoot / Command Thrust
Use this kit for Mercury 40-60HP EFI outboards with BigFoot or Command Thrust gearcases. Oil and gear lube sold separately.
View Product
300 Hour Kit With Oil - BigFoot / Command Thrust
Complete 300 hour maintenance kit with oil and gear lube for compatible BigFoot and Command Thrust gearcase models.
View ProductWhat This Service Kit is Used For
The Mercury 8M0113483-L service kit is used for 300 hour maintenance on compatible Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards equipped with standard gearcases.
A 300 hour maintenance service is more extensive than a standard 100 hour service and commonly includes fuel system maintenance, cooling system service, spark plug replacement, water pump service, oil service, and gearcase maintenance.
Key Features and Benefits
- OEM Mercury 300 hour service kit
- Fits Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards
- Fits serial numbers 1C000001 and higher
- For standard gearcase models only
- Includes Mercury 10W30 engine oil
- Includes gear lube for gearcase service
- Alternative kit available for customers preferring different oils
- BigFoot / Command Thrust kits linked above
Service Kit Details
- Part Number: 8M0113483-L
- Base Kit: 8M0113483
- Application: Mercury 40-60HP FourStroke EFI Outboards
- Serial Range: 1C000001 & Higher
- Gearcase Type: Standard Gearcase
- Service Interval: 300 Hour Maintenance
- Oil Included: Mercury 10W30
- Gear Lube Included: Yes
FAQ
What engines does this kit fit?
This kit fits Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards
with serial numbers 1C000001 and higher equipped with standard gearcases.
Does this fit BigFoot or Command Thrust gearcases?
No. BigFoot and Command Thrust kits are linked above.
Does this kit include oil and gear lube?
Yes. This kit includes Mercury 10W30 engine oil and gear lube.
What if I prefer a different oil?
Customers who prefer different Mercury oil options can order
the standard 8M0113483 kit and select their preferred oil separately.
How much engine oil does this motor use?
Approximately 4 quarts or 1 gallon.
How much gear lube is required?
Approximately 1 quart for standard gearcase models.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil and lubricants may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0113483-L, 8M0113483, 8M0090559, 8M0090559-L, Mercury 40HP 300 hour kit with oil, Mercury 50HP 300 hour kit with oil, Mercury 60HP 300 hour kit with oil, Mercury standard gearcase 300 hour kit, Mercury standard gearcase maintenance kit, Mercury 300 hour kit with 10W30, Mercury serial 1C000001 300 hour kit, Mercury FourStroke EFI 300 hour service, Mercury BigFoot 300 hour kit, Mercury Command Thrust 300 hour kit, Mercury 40-60HP maintenance kit with oil
OEM Mercury 300 Hour Service Kit With Oil
Mercury 5.7L V10 350HP-425HP Verado 300 Hour Maintenance Kit
This OEM Mercury 300 hour service kit with oil is designed for Mercury 5.7L V10 350HP-425HP Verado outboards equipped with the 6.44 gearcase. It includes the major scheduled maintenance components along with Mercury 25W50 engine oil for complete engine oil service.
Important: This kit includes engine oil, but it does not include gear lube. Mercury V10 standard rotation and counter rotation gearcases require different gear lube quantities, so gear lube should be selected separately below.
Compatible Applications
| Engine Platform | Horsepower Range | Displacement | Application Notes |
|---|---|---|---|
| Mercury Verado V10 | 350HP-425HP | 5.7L FourStroke | Models equipped with the Mercury 6.44 gearcase only |
This service kit is specifically for Mercury 5.7L V10 Verado models equipped with the 6.44 gearcase.
This kit includes Mercury 25W50 engine oil, but it does not include gear lube.
Standard rotation Mercury V10 gearcases use approximately 1 quart of gear lube.
Counter rotation Mercury V10 gearcases use approximately 2.3 quarts, so customers should order 3 quarts for proper service.
If you do not want the version with included Mercury 25W50 engine oil, use the no-oil version and select your oil separately.
View Mercury V10 300 Hour Service Kit Without Oil
What is Included
| Included Component | Application |
|---|---|
| OEM Mercury 300 hour maintenance components | Scheduled Mercury V10 service interval |
| OEM Mercury oil filter | Engine oil filtration service |
| OEM Mercury fuel filter components | Fuel system maintenance |
| OEM Mercury spark plugs | Ignition system maintenance |
| OEM Mercury thermostat and cooling system components | Cooling system maintenance |
| OEM Mercury water pump repair components | Water pump service |
| OEM Mercury seals and maintenance hardware | Routine scheduled maintenance replacement items |
| Mercury 25W50 engine oil | Engine lubrication service |
Gear Lube Options - Sold Separately
| Gear Lube | Product | Quantity Required |
|---|---|---|
| Premium 80W90 Gear Lube | Mercury Premium 80W90 Gear Lube | Standard rotation: 1 quart Counter rotation: 3 quarts |
| Extreme Performance 85W90 Gear Lube | Mercury Extreme Performance Gear Lube | Standard rotation: 1 quart Counter rotation: 3 quarts |
Complete Your Service
300 Hour Service Kit Without Oil
OEM Mercury 300 hour maintenance kit without engine oil or gear lube for Mercury 5.7L V10 350HP-425HP Verado outboards with the 6.44 gearcase.
View Product
Mercury V10 Anode Kit
OEM Mercury anode kit for Mercury 5.7L V10 350HP-425HP Verado outboards. Helps protect against galvanic corrosion in freshwater and saltwater use.
View ProductWhat This Service Kit is Used For
This OEM Mercury 300 hour service kit with oil is used for major scheduled maintenance on compatible Mercury 5.7L V10 Verado 350HP-425HP outboards equipped with the 6.44 gearcase.
The included Mercury 25W50 engine oil helps simplify scheduled maintenance while the OEM Mercury service components support proper cooling system, fuel system, ignition, and water pump service.
Because standard rotation and counter rotation gearcases use different amounts of gear lube, this kit does not include gear lube. Customers should choose the proper lubricant and quantity separately.
Customers performing 300 hour service should also inspect anodes, lower unit lubricant condition, and additional wear items depending on operating conditions and service history.
Key Features and Benefits
- OEM Mercury 300 hour maintenance kit with engine oil
- Fits Mercury 5.7L V10 350HP-425HP Verado models with the 6.44 gearcase
- Includes Mercury 25W50 engine oil
- Designed for scheduled 300 hour service
- Does not include gear lube
- Allows customers to select the proper gear lube quantity separately
- Includes major cooling system and water pump service components
- Supports long-term engine reliability and performance
Service Kit Details
- Kit Part Number: 8M0207808-L
- Brand: Mercury Marine
- Application: Mercury 5.7L V10 Verado Outboards
- Horsepower Range: 350HP-425HP
- Gearcase Requirement: Mercury 6.44 Gearcase Only
- Service Interval: 300 Hour Maintenance
- Engine Oil Included: Yes - Mercury 25W50
- Gear Lube Included: No
- Standard Rotation Gear Lube Required: Approximately 1 quart
- Counter Rotation Gear Lube Required: Approximately 2.3 quarts - order 3 quarts
FAQ
What engines does this 300 hour service kit fit?
This kit fits Mercury 5.7L V10 Verado 350HP-425HP outboards equipped with the 6.44 gearcase.
Does this kit include engine oil?
Yes. This version includes Mercury 25W50 engine oil.
Does this kit include gear lube?
No. Gear lube is not included because standard rotation and counter rotation gearcases use different amounts.
How much gear lube should I order?
Standard rotation gearcases use approximately 1 quart. Counter rotation gearcases use approximately 2.3 quarts, so order 3 quarts for counter rotation service.
Why is the 6.44 gearcase important?
Mercury used different gearcase configurations on V10 Verado models, so this kit is specifically intended for engines equipped with the 6.44 gearcase.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits and lubricants must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0207808-L, Mercury V10 300 hour service kit with oil, Mercury 5.7L V10 service kit, Mercury Verado V10 maintenance kit, Mercury 350HP service kit, Mercury 400HP service kit, Mercury 425HP service kit, Mercury 6.44 gearcase service kit, Mercury V10 kit with oil, Mercury 25W50 oil, Mercury V10 gear lube not included, Mercury Premium 80W90 gear lube, Mercury Extreme Performance gear lube, Mercury V10 anode kit, Mercury Verado maintenance parts
OEM Mercury 300-Hour Verado Service Kit with Oil & Gear Lube
Mercury 8M0149932-L Service Kit for 4.6L V8 Verado & Verado SeaPro Outboards
The Mercury 8M0149932-L 300-Hour Service Kit is designed for Mercury 4.6L V8 Verado and Verado SeaPro outboards using the AMS (Advanced MidSection).
This complete OEM Mercury maintenance package includes the major 300-hour service components along with Mercury 10W30 engine oil and Mercury gear lube.
Compatible Applications
| Engine Family | Engine Size | Midsection | Application Notes |
|---|---|---|---|
| Mercury Verado | 4.6L V8 FourStroke | AMS / Advanced MidSection | Fits compatible Mercury Verado AMS outboards |
| Mercury Verado SeaPro | 4.6L V8 FourStroke | AMS / Advanced MidSection | Fits compatible Mercury Verado SeaPro AMS outboards |
AMS stands for Advanced MidSection. Always verify your exact engine model and serial number before ordering.
What is Included
- OEM Mercury oil filter
- OEM Mercury fuel filter
- Oil drain seal
- Spark plugs
- Thermostat
- Alternator belt
- Anodes
- Water pump repair kit
- Mercury 10W30 engine oil
- Mercury gear lube
OEM Part Numbers & Cross References
| Brand / Type | Part Number |
|---|---|
| Mercury OEM | 8M0149932-L |
| Related Kit Without Oil | 8M0149932 |
| Application | 300-Hour Verado AMS Service Kit with Oil & Gear Lube |
Prefer a Different Oil Weight?
This version includes Mercury 10W30 engine oil and Mercury gear lube.
Some customers prefer ordering their service kit without oil so they can choose a different Mercury oil weight or oil type.
If you would rather choose your own oil separately, see:
Mercury 8M0149932 300-Hour Verado AMS Service Kit Without Oil
Related AMS Anode Kit
Mercury Verado AMS and Verado SeaPro AMS outboards use a different anode configuration than CMS models.
For replacement AMS aluminum anodes, see:
Mercury 8M0205955 Aluminum Anode Kit
What This Service Kit is Used For
This Mercury 300-hour maintenance kit is designed for scheduled service on compatible Mercury Verado and Verado SeaPro AMS outboards.
Regular maintenance helps support long-term reliability, proper cooling, fuel system performance, and corrosion protection.
Mercury packages the required 300-hour service components together to simplify maintenance and reduce the need to source parts individually.
Key Features and Benefits
- Genuine OEM Mercury 300-hour maintenance kit
- Fits Mercury 4.6L V8 Verado and Verado SeaPro AMS outboards
- Includes oil filter, fuel filter, and oil drain seal
- Includes spark plugs, thermostat, alternator belt, and water pump repair kit
- Includes AMS anodes
- Includes Mercury 10W30 engine oil and gear lube
- Convenient all-in-one maintenance package
- Produced to Mercury OEM specifications
Service Kit Details
- Brand: Mercury / Quicksilver
- Part Number: 8M0149932-L
- Part Type: 300-Hour Service Kit with Oil & Gear Lube
- Application: Mercury 4.6L V8 Verado & Verado SeaPro AMS Outboards
- Midsection: AMS / Advanced MidSection
- Includes Oil: Yes
- Includes Gear Lube: Yes
- Quantity Sold: Kit
FAQ
What engines does Mercury 8M0149932-L fit?
This kit fits Mercury 4.6L V8 Verado and Verado SeaPro AMS outboards.
Does this kit include engine oil?
Yes. This version includes Mercury 10W30 engine oil.
Does this kit include gear lube?
Yes. Mercury gear lube is included.
What parts are included in this 300-hour service kit?
The kit includes an oil filter, fuel filter, oil drain seal,
spark plugs, thermostat, alternator belt, water pump repair kit,
AMS anodes, engine oil, and gear lube.
What is AMS?
AMS stands for Advanced MidSection and is used on Mercury Verado
and certain Mercury Racing applications.
Which anode kit goes with this engine?
This AMS application uses Mercury aluminum anode kit 8M0205955.
Is there a version without oil?
Yes. Mercury 8M0149932 includes the same 300-hour maintenance parts
without engine oil and gear lube.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Service kits should be verified for correct fitment before installation.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0149932-L, Mercury Verado 300 hour service kit, Mercury AMS service kit, Mercury Verado SeaPro service kit, Mercury 4.6L V8 maintenance kit, Mercury Verado maintenance kit, Mercury AMS maintenance kit, Mercury spark plug service kit, Mercury thermostat service kit, Mercury water pump repair kit, Mercury alternator belt kit, Mercury anode service kit, Mercury 10W30 oil kit, Mercury gear lube kit, 8M0149932, 8M0205955
OEM Mercury 300 Hour Service Kit
Mercury 5.7L V10 350HP-425HP Verado 300 Hour Maintenance Kit
This OEM Mercury 300 hour service kit is designed for Mercury 5.7L V10 350HP-425HP Verado outboards equipped with the 6.44 gearcase. It includes the major scheduled maintenance components needed for 300 hour service.
This version does not include engine oil or gear lube, making it a good option for customers who want to choose their Mercury 25W50 oil and gear lube separately.
Compatible Applications
| Engine Platform | Horsepower Range | Displacement | Application Notes |
|---|---|---|---|
| Mercury Verado V10 | 350HP-425HP | 5.7L FourStroke | Models equipped with the Mercury 6.44 gearcase only |
This service kit is specifically for Mercury 5.7L V10 Verado models equipped with the 6.44 gearcase.
Always verify your gearcase configuration before ordering maintenance components.
This 300 hour kit does not include engine oil or gear lube. If you prefer the version with Mercury 25W50 engine oil included, use this option:
View Mercury V10 300 Hour Service Kit With Oil
What is Included
| Included Component | Application |
|---|---|
| OEM Mercury 300 hour maintenance components | Scheduled Mercury V10 service interval |
| OEM Mercury oil filter | Engine oil filtration service |
| OEM Mercury fuel filter components | Fuel system maintenance |
| OEM Mercury spark plugs | Ignition system maintenance |
| OEM Mercury thermostat and cooling system components | Cooling system maintenance |
| OEM Mercury water pump repair components | Water pump service |
| OEM Mercury seals and maintenance hardware | Routine scheduled maintenance replacement items |
Additional Mercury 25W50 Oil Options
| Oil Type | Product | Quantity Required |
|---|---|---|
| Mercury 25W50 Quart | Mercury 25W50 Engine Oil - 1 Quart | 10 Quarts |
| Mercury 25W50 Gallon + Quart Combination |
Mercury Verado 25W50 Engine Oil - 1 Gallon
Mercury 25W50 Engine Oil - 1 Quart |
2 Gallons + 2 Quarts |
Recommended Gear Lube Options
| Gear Lube | Product | Quantity Required |
|---|---|---|
| Premium 80W90 Gear Lube | Mercury Premium 80W90 Gear Lube | Standard rotation: 1 quart Counter rotation: 3 quarts |
| Extreme Performance 85W90 Gear Lube | Mercury Extreme Performance Gear Lube | Standard rotation: 1 quart Counter rotation: 3 quarts |
Standard rotation Mercury V10 gearcases use approximately 1 quart of gear lube.
Counter rotation Mercury V10 gearcases use approximately 2.3 quarts, so customers should order 3 quarts for proper service.
Complete Your Service
300 Hour Service Kit With Oil
Complete OEM Mercury 300 hour maintenance kit with Mercury 25W50 engine oil for Mercury 5.7L V10 350HP-425HP Verado outboards with the 6.44 gearcase.
View Product
Mercury V10 Anode Kit
OEM Mercury anode kit for Mercury 5.7L V10 350HP-425HP Verado outboards. Helps protect against galvanic corrosion in freshwater and saltwater use.
View ProductWhat This Service Kit is Used For
This OEM Mercury 300 hour service kit is used for major scheduled maintenance on compatible Mercury 5.7L V10 Verado 350HP-425HP outboards equipped with the 6.44 gearcase.
Routine 300 hour maintenance helps support long-term engine reliability, cooling system performance, fuel system operation, and proper water pump function.
This version is intended for customers who prefer to select their own Mercury 25W50 engine oil and gear lube separately.
Customers performing 300 hour service should also inspect anodes, lower unit lubricant condition, and additional wear items depending on engine hours and operating conditions.
Key Features and Benefits
- OEM Mercury 300 hour maintenance kit
- Fits Mercury 5.7L V10 350HP-425HP Verado models with the 6.44 gearcase
- Designed for scheduled 300 hour service
- Does not include engine oil or gear lube
- Allows customers to choose preferred Mercury lubricants separately
- Includes major maintenance service components
- Supports cooling system and water pump maintenance
- Pairs with Mercury V10 anode maintenance components
Service Kit Details
- Kit Part Number: 8M0207808
- Brand: Mercury Marine
- Application: Mercury 5.7L V10 Verado Outboards
- Horsepower Range: 350HP-425HP
- Gearcase Requirement: Mercury 6.44 Gearcase Only
- Service Interval: 300 Hour Maintenance
- Engine Oil Included: No
- Gear Lube Included: No
- Oil Quantity Required: 2 gallons + 2 quarts, or 10 quarts
- Standard Rotation Gear Lube Required: Approximately 1 quart
- Counter Rotation Gear Lube Required: Approximately 2.3 quarts - order 3 quarts
FAQ
What engines does this 300 hour service kit fit?
This kit fits Mercury 5.7L V10 Verado 350HP-425HP outboards equipped with the 6.44 gearcase.
Does this kit include engine oil?
No. Mercury 25W50 engine oil is sold separately and linked above.
Does this kit include gear lube?
No. Gear lube is sold separately because standard rotation and counter rotation gearcases use different amounts.
How much gear lube should I order?
Standard rotation gearcases use approximately 1 quart. Counter rotation gearcases use approximately 2.3 quarts, so order 3 quarts for counter rotation service.
Is there a version with oil included?
Yes. The Mercury 8M0207808-L version includes Mercury 25W50 engine oil and is linked above.
Why is the 6.44 gearcase important?
Mercury used different gearcase configurations on V10 Verado models, so this kit is specifically intended for engines equipped with the 6.44 gearcase.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0207808, Mercury V10 300 hour service kit, Mercury 5.7L V10 service kit, Mercury Verado V10 maintenance kit, Mercury 350HP service kit, Mercury 400HP service kit, Mercury 425HP service kit, Mercury 6.44 gearcase service kit, Mercury V10 kit without oil, Mercury 25W50 oil, Mercury Premium 80W90 gear lube, Mercury Extreme Performance gear lube, Mercury V10 anode kit, Mercury Verado maintenance parts
OEM Mercury 40-60HP 300 Hour Service Kit
Mercury 40-60HP 300 Hour Kit Standard Gearcase
The Mercury 8M0113483 300 Hour Service Kit is designed for compatible Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards with serial numbers 1C000001 and higher equipped with standard gearcases.
This 300 hour maintenance kit includes the routine service components commonly replaced during scheduled maintenance. Oil and gear lube are sold separately.
Compatible Applications
| Brand | Horsepower | Engine Type | Gearcase Type | Serial Range |
|---|---|---|---|---|
| Mercury | 40HP | FourStroke EFI Outboard | Standard Gearcase | 1C000001 & Higher |
| Mercury | 50HP | FourStroke EFI Outboard | Standard Gearcase | 1C000001 & Higher |
| Mercury | 60HP | FourStroke EFI Outboard | Standard Gearcase | 1C000001 & Higher |
This Mercury 300 hour service kit fits Mercury 40-60HP FourStroke EFI outboards with serial numbers 1C000001 and higher equipped with standard gearcases only.
If your engine has a BigFoot or Command Thrust gearcase, use the BigFoot / Command Thrust kits linked below instead.
What is Included
| Included Component | Application |
|---|---|
| Oil Filter | Engine oil filtration service |
| Fuel Filters | Fuel system maintenance |
| Spark Plugs | Ignition system maintenance |
| Water Pump Components | Cooling system service |
| Thermostat Components | Cooling system maintenance |
| Drain & Vent Seals | Gearcase service |
Prefer to Buy the Kit with 10W30 Oil & Gear Lube?
Mercury 300 Hour Kit With 10W30 Oil & Gear Lube
Prefer a complete maintenance package? Order the Mercury 8M0113483-L 300 Hour Service Kit with Mercury 10W30 engine oil and gear lube included.
View Complete KitOil Capacity & Recommended Oil Options
Mercury 40-60HP FourStroke EFI engines use approximately 4 quarts of engine oil, or 1 gallon.
| Oil Type | Product | Quantity Required |
|---|---|---|
| Mercury 10W30 | Mercury 10W30 Engine Oil - Quart | 4 quarts |
| Mercury 10W30 | Mercury 10W30 Engine Oil - Gallon | 1 gallon |
| Mercury 10W30 Synthetic Blend | Mercury 10W30 Synthetic Blend - Quart | 4 quarts |
| Mercury 10W30 Synthetic Blend | Mercury 10W30 Synthetic Blend - Gallon | 1 gallon |
| Mercury 10W30 Full Synthetic | Mercury 10W30 Full Synthetic - Gallon | 1 gallon |
| Mercury 25W40 | Mercury 25W40 Engine Oil - Quart | 4 quarts |
| Mercury 25W40 Synthetic Blend | Mercury 25W40 Synthetic Blend - Quart | 4 quarts |
| Mercury 25W40 Synthetic Blend | Mercury 25W40 Synthetic Blend - Gallon | 1 gallon |
Recommended Gear Lube
Gear Lube Quantity:
Standard gearcase applications use approximately
1 quart of gear lube.
| Gear Lube Type | Product |
|---|---|
| Mercury Premium Gear Lube 80W90 | Mercury Premium Gear Lube 80W90 - Quart |
| Mercury High Performance Gear Lube | Mercury High Performance Gear Lube - Quart |
BigFoot / Command Thrust 300 Hour Kits
300 Hour Kit - BigFoot / Command Thrust
Use this kit for Mercury 40-60HP EFI outboards with BigFoot or Command Thrust gearcases. Oil and gear lube sold separately.
View Product
300 Hour Kit With Oil - BigFoot / Command Thrust
Complete 300 hour maintenance kit with oil and gear lube for compatible BigFoot and Command Thrust gearcase models.
View ProductWhat This Service Kit is Used For
The Mercury 8M0113483 service kit is used for 300 hour maintenance on compatible Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards equipped with standard gearcases.
A 300 hour service includes more extensive maintenance than a basic 100 hour service and helps support fuel system performance, cooling system reliability, ignition performance, lubrication service, and long-term outboard protection.
Key Features and Benefits
- OEM Mercury 300 hour service kit
- Fits Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards
- Fits serial numbers 1C000001 and higher
- For standard gearcase models only
- Oil and gear lube sold separately
- Kit with 10W30 oil and gear lube available separately
- BigFoot / Command Thrust kits linked above
Service Kit Details
- Part Number: 8M0113483
- Application: Mercury 40-60HP FourStroke EFI Outboards
- Serial Range: 1C000001 & Higher
- Gearcase Type: Standard Gearcase
- Service Interval: 300 Hour Maintenance
- Oil and Gear Lube: Sold Separately
FAQ
What engines does this kit fit?
This kit fits Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards
with serial numbers 1C000001 and higher equipped with standard gearcases.
Does this fit BigFoot or Command Thrust gearcases?
No. BigFoot and Command Thrust kits are linked above.
Does this kit include oil and gear lube?
Oil and gear lube are sold separately.
Is there a version with 10W30 oil and gear lube included?
Yes. The Mercury 8M0113483-L kit with 10W30 oil and gear lube
is linked above.
How much engine oil does this motor use?
Approximately 4 quarts or 1 gallon.
How much gear lube is required?
Approximately 1 quart for standard gearcase models.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil and lubricants may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0113483, 8M0113483-L, 8M0090559, 8M0090559-L, Mercury 40HP 300 hour kit, Mercury 50HP 300 hour kit, Mercury 60HP 300 hour kit, Mercury standard gearcase 300 hour kit, Mercury 40-60HP standard gearcase maintenance, Mercury serial 1C000001 300 hour kit, Mercury 300 hour kit oil and gear lube sold separately, Mercury 300 hour kit with 10W30, Mercury BigFoot 300 hour kit, Mercury Command Thrust 300 hour kit, Mercury FourStroke EFI 300 hour service
OEM Mercury 40-60HP 300 Hour Service Kit With Oil
Mercury 40-60HP 300 Hour Kit BigFoot / Command Thrust
The Mercury 8M0090559-L 300 Hour Service Kit is a complete maintenance package for Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards with serial numbers 1C000001 and higher equipped with BigFoot or Command Thrust gearcases.
This 300 hour maintenance kit includes the required service components along with engine oil and gear lube for routine scheduled maintenance.
Compatible Applications
| Brand | Horsepower | Engine Type | Gearcase Type | Serial Range |
|---|---|---|---|---|
| Mercury | 40HP | FourStroke EFI Outboard | BigFoot / Command Thrust | 1C000001 & Higher |
| Mercury | 50HP | FourStroke EFI Outboard | BigFoot / Command Thrust | 1C000001 & Higher |
| Mercury | 60HP | FourStroke EFI Outboard | BigFoot / Command Thrust | 1C000001 & Higher |
This Mercury 300 hour service kit fits Mercury 40-60HP FourStroke EFI outboards with serial numbers 1C000001 and higher equipped with BigFoot or Command Thrust gearcases only.
If your engine has a standard gearcase, use the standard gearcase 300 hour kits linked below instead.
What is Included
| Included Component | Application |
|---|---|
| Oil Filter | Engine oil filtration service |
| Fuel Filters | Fuel system maintenance |
| Spark Plugs | Ignition system maintenance |
| Water Pump Components | Cooling system service |
| Thermostat Components | Cooling system maintenance |
| Mercury Engine Oil | Engine oil service |
| Mercury Gear Lube | Gearcase lubricant service |
Prefer to Choose a Different Oil?
Some customers prefer to purchase their own Mercury oil separately, including Mercury 25W40, Synthetic Blend, or Full Synthetic options.
If you prefer to select your own engine oil and gear lube, order the standard 300 hour kit below.
Order 8M0090559 - Oil and Gear Lube Sold SeparatelyIncluded Oil & Gear Lube Information
This kit includes Mercury engine oil and gear lube for the complete 300 hour maintenance service.
Mercury 40-60HP FourStroke EFI engines use approximately 4 quarts of engine oil, or 1 gallon.
BigFoot and Command Thrust gearcases may require different gear lube fill amounts than standard gearcases. Always verify fill quantity in your Mercury owner's manual.
Standard Gearcase 300 Hour Kits
300 Hour Kit - Standard Gearcase
Use this kit for Mercury 40-60HP EFI outboards with standard gearcases. Oil and gear lube sold separately.
View Product
300 Hour Kit With Oil - Standard Gearcase
Complete 300 hour maintenance kit with oil and gear lube for compatible standard gearcase models.
View ProductWhat This Service Kit is Used For
The Mercury 8M0090559-L service kit is used for 300 hour maintenance on compatible Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards equipped with BigFoot or Command Thrust gearcases.
A 300 hour maintenance service is more extensive than a standard 100 hour service and commonly includes fuel system maintenance, cooling system service, spark plug replacement, water pump service, oil service, and gearcase maintenance.
Key Features and Benefits
- OEM Mercury 300 hour service kit
- Fits Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards
- Fits serial numbers 1C000001 and higher
- For BigFoot and Command Thrust gearcase models
- Includes engine oil and gear lube
- Complete maintenance package for scheduled service
- Alternative kit available for customers preferring different oils
- Standard gearcase kits linked above
Service Kit Details
- Part Number: 8M0090559-L
- Base Kit: 8M0090559
- Application: Mercury 40-60HP FourStroke EFI Outboards
- Serial Range: 1C000001 & Higher
- Gearcase Type: BigFoot / Command Thrust
- Service Interval: 300 Hour Maintenance
- Oil Included: Yes
- Gear Lube Included: Yes
FAQ
What engines does this kit fit?
This kit fits Mercury 40HP, 50HP, and 60HP FourStroke EFI outboards
with serial numbers 1C000001 and higher equipped with BigFoot
or Command Thrust gearcases.
Does this fit standard gearcase models?
No. This kit is for BigFoot and Command Thrust gearcases only.
Standard gearcase kits are linked above.
Does this kit include oil and gear lube?
Yes. This kit includes Mercury engine oil and gear lube.
What if I prefer a different oil?
Customers who prefer different Mercury oil options can order
the standard 8M0090559 kit and select their preferred oil separately.
How do I know if I have a BigFoot or Command Thrust gearcase?
Verify your gearcase type using your Mercury model information
or owner's manual before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Maintenance kits must be new, unused, and in original packaging.
- Opened oil and lubricants may not be returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0090559-L, 8M0090559, 8M0113483, 8M0113483-L, Mercury 40HP 300 hour kit with oil, Mercury 50HP 300 hour kit with oil, Mercury 60HP 300 hour kit with oil, Mercury BigFoot 300 hour service kit, Mercury Command Thrust 300 hour kit, Mercury 40-60HP BigFoot maintenance kit, Mercury 40-60HP Command Thrust maintenance kit, Mercury serial 1C000001 300 hour service, Mercury standard gearcase 300 hour kit, Mercury 300 hour kit with oil and gear lube, Mercury FourStroke EFI 300 hour service
OEM Mercury 300-Hour Service Kit with Oil & Gear Lube
Mercury 8M0149931-L Service Kit for 4.6L V8 CMS SeaPro & ProXS Outboards
The Mercury 8M0149931-L 300-Hour Service Kit is an OEM maintenance kit for Mercury 4.6L V8 CMS (Conventional Mid Section) SeaPro and ProXS 4-stroke outboards.
This complete version includes the major 300-hour service replacement items, plus Mercury 10W30 engine oil and Mercury gear lube for a more complete maintenance package.
Compatible Applications
| Engine Family | Horsepower / Type | Midsection | Application Notes |
|---|---|---|---|
| Mercury SeaPro | 4.6L V8 FourStroke | CMS / Conventional Mid Section | Fits compatible Mercury V8 CMS SeaPro outboards |
| Mercury ProXS | 4.6L V8 FourStroke | CMS / Conventional Mid Section | Fits compatible Mercury V8 CMS ProXS outboards |
CMS stands for Conventional Mid Section. Always verify your engine model, serial number, and owner’s manual before ordering service kits or maintenance parts.
What is Included
- OEM Mercury oil filter
- OEM Mercury fuel filter
- Oil drain seal
- Spark plugs
- Thermostat
- Alternator belt
- Water pump repair kit
- Anodes
- Mercury 10W30 engine oil
- Mercury gear lube
OEM Part Numbers & Cross References
| Brand / Type | Part Number |
|---|---|
| Mercury OEM | 8M0149931-L |
| Related Kit Without Oil | 8M0149931 |
| Application | 300-Hour V8 CMS Service Kit with Oil & Gear Lube |
Prefer to Choose Your Own Oil?
This kit includes Mercury 10W30 engine oil and gear lube. Some customers prefer to choose a different Mercury oil viscosity or purchase fluids separately.
If you want the same 300-hour kit without oil and gear lube, see:
Related Anode Kit
This V8 CMS application uses the Mercury CMS aluminum anode kit. If you are replacing anodes separately or want a complete corrosion protection kit, see:
Mercury 8M0205953 Aluminum Anode Kit for CMS V6 / V8 Outboards
What This Service Kit is Used For
This Mercury 300-hour service kit is used for scheduled maintenance on compatible V8 CMS SeaPro and ProXS 4-stroke outboards.
Periodic maintenance helps protect your investment, support reliable operation, and keep your engine running longer and stronger.
Mercury packages the required 300-hour service replacement items together so customers do not have to order each part separately.
Key Features and Benefits
- Genuine OEM Mercury 300-hour maintenance kit
- Fits Mercury 4.6L V8 CMS SeaPro and ProXS 4-stroke outboards
- Includes oil filter, fuel filter, and oil drain seal
- Includes spark plugs, thermostat, and alternator belt
- Includes water pump repair kit and anodes
- Includes Mercury 10W30 engine oil and gear lube
- Convenient all-in-one maintenance package
- Produced to Mercury OEM specifications
Service Kit Details
- Brand: Mercury / Quicksilver
- Part Number: 8M0149931-L
- Part Type: 300-Hour Service Kit with Oil & Gear Lube
- Application: Mercury 4.6L V8 CMS SeaPro and ProXS FourStroke Outboards
- Midsection: CMS / Conventional Mid Section
- Includes Oil: Yes
- Includes Gear Lube: Yes
- Quantity Sold: Kit
FAQ
What engines does Mercury 8M0149931-L fit?
This kit fits Mercury 4.6L V8 CMS SeaPro and ProXS 4-stroke outboards.
Does this kit include engine oil?
Yes. This version includes Mercury 10W30 engine oil.
Does this kit include gear lube?
Yes. This version includes Mercury gear lube.
What parts are included in this 300-hour kit?
The kit includes an oil filter, fuel filter, oil drain seal, spark plugs,
thermostat, alternator belt, water pump repair kit, anodes, engine oil,
and gear lube.
Is there a version without oil?
Yes. Mercury 8M0149931 includes the same 300-hour service parts without
engine oil and gear lube.
Which anode kit goes with this engine?
This CMS application uses Mercury aluminum anode kit 8M0205953.
Is this an OEM Mercury kit?
Yes. This is a genuine Mercury / Quicksilver service kit produced to
Mercury OEM specifications.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Service kits should be verified for correct fitment before installation.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0149931-L, Mercury 300 hour service kit with oil, Mercury V8 CMS service kit, Mercury 4.6L V8 service kit, Mercury SeaPro 300 hour kit with oil, Mercury ProXS 300 hour kit with oil, Mercury CMS maintenance kit, Mercury oil filter fuel filter kit, Mercury spark plug service kit, Mercury water pump repair kit, Mercury thermostat service kit, Mercury alternator belt kit, Mercury anode service kit, Mercury 10W30 oil kit, Mercury gear lube kit, 8M0149931, 8M0205953