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806993
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 100 Hour Service Kit
Mercury L6 Verado 200HP-400HP Serial 2B144123-Up Maintenance Kit
This genuine OEM Mercury maintenance kit contains the routine service components needed for compatible Mercury L6 Verado 200HP-400HP FourStroke outboards.
Designed for scheduled 100 hour maintenance service on compatible Verado models beginning with serial range 2B144123 and newer. This version does NOT include engine oil or gear lube.
Compatible Applications
| Engine Platform | Horsepower Range | Serial Range | Application Notes |
|---|---|---|---|
| Mercury L6 Verado | 200HP-400HP | 2B144123-Up | Select L6 FourStroke Verado outboards |
If you would like the complete maintenance kit including oil (10W30) and gear lube, see this version instead:
View Complete Mercury Service Kit With Oil & Gear Lube
What is Included
| Qty | Included Component | Application |
|---|---|---|
| 1 | OEM Mercury Oil Filter | Routine engine oil service |
| 1 | Water Separating Fuel Filter | Fuel filtration service |
| 1 | Drain Seals & Service Components | Routine maintenance service |
Recommended Gear Lube
Mercury High Performance Gear Lube Quart
Quantity Required: 2 Quarts
Recommended Engine Oil Options
| Oil Type | Product | Quantity Required |
|---|---|---|
| Mercury SAE 10W30 | Mercury 10W30 Engine Oil Gallon | 2 Gallons |
| Mercury 10W30 Synthetic Blend | Mercury 10W30 Synthetic Blend Gallon | 2 Gallons |
| Mercury 25W40 Synthetic Blend | Mercury 25W40 Synthetic Blend Gallon | 2 Gallons |
| Mercury 25W40 Engine Oil | Mercury 25W40 Engine Oil | 8 Quarts |
Recommended Verado Anode Kits
Mercury L6 Verado 200HP-300HP Anode Kit
Tecno Seal aluminum anode kit for Mercury inline 6-cylinder Verado 200HP-300HP outboards. Helps protect transom and gearcase components from galvanic corrosion.
View Product
Mercury L6 Verado 350HP-400HP Anode Kit
Tecno Seal aluminum anode kit for Mercury L6 Verado 350HP-400HP outboards. Designed for corrosion protection of gearcase and transom components.
View ProductWhat This Service Kit is Used For
This OEM Mercury service kit provides the routine maintenance components required for scheduled 100 hour service on compatible Mercury L6 Verado FourStroke outboards.
Regular maintenance helps support fuel system cleanliness, engine lubrication performance, cooling system reliability, and long-term engine durability.
Replacing filters and service components at recommended service intervals helps reduce engine wear and maintain dependable offshore performance.
Many customers prefer this version of the kit because it allows them to select their preferred Mercury engine oil and gear lube separately.
Key Features and Benefits
- Genuine OEM Mercury 100 hour maintenance kit
- Fits Mercury L6 Verado 200HP-400HP outboards
- Fits serial number range 2B144123 and newer
- Includes OEM Mercury maintenance components
- Designed for routine scheduled service
- Does not include engine oil or gear lube
- Allows customers to choose preferred Mercury lubricants
- Convenient all-in-one maintenance package
Service Kit Details
- Kit Part Number: 8M0120657
- Brand: Mercury Marine
- Application: Mercury L6 Verado 200HP-400HP
- Serial Range: 2B144123-Up
- Service Interval: 100 Hour Maintenance
- Oil Included: No
- Gear Lube Included: No
- Engine Platform: L6 Verado FourStroke
FAQ
What engines does this service kit fit?
This kit fits compatible Mercury L6 Verado 200HP-400HP FourStroke outboards with serial numbers 2B144123 and newer.
Does this kit include engine oil?
No. Engine oil must be purchased separately.
Does this kit include gear lube?
No. Gear lube must be purchased separately.
Can I purchase a complete kit with oil and gear lube included?
Yes. Mercury also offers a complete version of this kit that includes both engine oil and gear lube.
How often should this maintenance be performed?
Mercury recommends routine 100 hour or annual maintenance depending on operating conditions and usage.
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.
- 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
8M0120657, Mercury L6 Verado service kit, Mercury Verado 100 hour kit, Mercury 200HP Verado maintenance kit, Mercury 225HP Verado maintenance kit, Mercury 250HP Verado maintenance kit, Mercury 300HP Verado maintenance kit, Mercury 350HP Verado maintenance kit, Mercury 400HP Verado maintenance kit, Mercury Verado oil change kit, Mercury Verado maintenance parts, Mercury 100 hour maintenance kit, Mercury serial 2B144123-Up service kit
MerCruiser Shift Shaft Bushing Assembly 65529-1 (OEM)
The 65529-1 Shift Shaft Bushing Assembly is a genuine Mercury MerCruiser OEM component designed specifically for Alpha One Gen II sterndrives. This assembly supports and seals the shift shaft where it enters the drive housing, ensuring precise shifting and proper sealing.
Fitment Overview
This OEM part replaces and supersedes earlier Mercury / MerCruiser part numbers including 815921A2, 815921A6, 815921A8, 815921A10, 815921A17, and 815921A21.
All of these part numbers correspond to the same shift shaft bushing assembly used in Alpha One Gen II sterndrive applications.
Compatibility
| Brand | Drive Model | Application |
|---|---|---|
| MerCruiser | Alpha One Gen II | Sterndrive |
| MerCruiser | Alpha One Gen II (all gear ratios) | Sterndrive |
This component is used in Alpha One Gen II drives across a wide range of marine applications.
Fits These Serial Ranges
Common applications include Alpha One Gen II sterndrives beginning approximately at serial range:
- 0D469859 and newer Alpha One Gen II production
Important: Always confirm compatibility using your sterndrive serial number or OEM part number.
Looking for a cost-effective aftermarket alternative?
View Pro Marine Shift Shaft Bushing Assembly 65529
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Mercury / MerCruiser OEM | 65529-1 |
| Mercury / MerCruiser OEM | 815921A2 |
| Mercury / MerCruiser OEM | 815921A6 |
| Mercury / MerCruiser OEM | 815921A8 |
| Mercury / MerCruiser OEM | 815921A10 |
| Mercury / MerCruiser OEM | 815921A17 |
| Mercury / MerCruiser OEM | 815921A21 |
| Aftermarket | 65529 (Pro Marine) |
What This Part Is Used For
This shift shaft bushing assembly supports the shift shaft and seals the entry point into the sterndrive housing. It ensures proper alignment and prevents water from entering the drive.
- Maintains shift shaft alignment
- Provides sealing at the drive housing
- Ensures smooth gear engagement
- Helps protect internal drive components
Using a genuine OEM part ensures proper fit, sealing, and long-term durability.
System Function and Connections
- System Type: Sterndrive shifting system
- Component Type: Shift shaft bushing assembly
- Location: Alpha One Gen II drive housing
FAQ
Is this a genuine Mercury part?
Yes, this is an OEM Mercury MerCruiser component.
What does this part fit?
It fits MerCruiser Alpha One Gen II sterndrives.
Does this replace older part numbers?
Yes, it replaces 815921A2, A6, A8, A10, A17, and A21.
Why choose OEM?
OEM parts are manufactured to exact specifications for proper fit and long-term reliability.
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.
- 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 Part Numbers
65529-1, 815921A21, 815921A10, 815921A8, 815921A6, 815921A2, MerCruiser Alpha One Gen II shift shaft bushing
21015
815921A10
815921A17
815921A2
815921A21
815921A6
815921A8
9-76136
884323T01
