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Mercury V8 4.6L 450R-500R 300 Hour Kit | Pro Marine USA
Shop Mercury V8 4.6L 450R and 500R 300 hour service kits for major scheduled Mercury Racing maintenance. These kits help simplify service intervals by combining many of the common maintenance parts required for high-performance Mercury Racing outboards.
Always verify your Mercury Racing model and serial number before ordering service parts.
Tip: Mercury 450R and 500R engines may use different maintenance components depending on model year, serial number range, and gearcase configuration.
Common Mercury 450R & 500R 300 Hour Kit Items
- Oil filters and fuel filters
- Spark plugs
- Thermostats and thermostat seals
- Water pump service components
- Engine anodes
- Drive belts on applicable models
- Engine oil when included
- Gear lube when included
Frequently Asked Questions
What is included in a Mercury 450R or 500R 300 hour service kit?
Most kits include common scheduled maintenance items such as oil filters, fuel filters, spark plugs, thermostats, water pump components, anodes, belts, seals, and related service parts. Some kits also include engine oil and gear lube.
Do Mercury 450R and 500R service kits include oil and gear lube?
Some kits include engine oil and lower unit gear lube, while others contain only maintenance parts. Review the individual product listing for exact kit contents.
Why is a 300 hour service important for Mercury Racing engines?
A 300 hour service helps maintain cooling system performance, fuel system reliability, corrosion protection, and overall engine performance by replacing common wear items at recommended service intervals.
How do I choose the correct Mercury 450R or 500R service kit?
Use your Mercury Racing model and serial number to confirm the correct maintenance kit for your specific engine application.
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 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