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Mercury V10 5.7L 350HP-425HP 6.44 Gearcase 300 Hour Service Kit With Oil
| Quantity | Price |
| 1 | 819.12 |
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
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