This OEM Mercury 25W40 Synthetic Blend Engine Oil (1 Quart) is the factory-approved lubricant for all Mercury and MerCruiser 4-stroke marine engines.
Engineered with a premium synthetic-blend formulation, it provides superior wear protection, oxidation resistance, and corrosion prevention in high-load, high-temperature marine environments.
Its balanced 25W40 viscosity ensures stable oil pressure, cleaner operation, and extended component life under extreme marine conditions.
Replaces OEM part number 858055K01, and is recommended for all Mercury 4-stroke outboards and MerCruiser sterndrives requiring FC-W certified oil.
Product Features
- Manufacturer: Mercury Marine (OEM)
- Application: Mercury and MerCruiser 4-Stroke Engines
- Type: Synthetic Blend Marine Engine Oil
- Viscosity: SAE 25W40
- Size: 1 Quart (32 oz)
- OEM Part #: 858055K01
- Cross Reference #: 8M0061368, 8M0078622, 8M0078629, 8M0078635, 8M0078641, 857492A1, 857494A1, 858052K01, 858052QC1, 858052Q01, 858055KC1, 858055QC1, 858055Q01, 858087KC1, 858087K01, 858087Q01, 883722K01, 883724K01, 883724Q01
- Performance: Superior corrosion resistance, anti-foam control, and film stability
- Certification: NMMA FC-W Certified for 4-Stroke Marine Engines
- Condition: 100% brand-new genuine Mercury OEM lubricant
- Warranty: Covered under Mercury Marine’s limited parts warranty
Additional Information
Note: Designed specifically for Mercury and MerCruiser 4-stroke inboards, sterndrives, and outboards.
Provides exceptional film strength for heavy-load, high-RPM operation.
Do not mix with non-Mercury or automotive oils to ensure optimal performance and warranty compliance.
Shipping Information
SHIPPING: Additional shipping fees to Alaska, Hawaii, U.S. Territories, or international destinations will be calculated after checkout.
You will receive an email and a PayPal money request for the additional shipping charges at the email address provided.
(Some items are excluded from international shipping.)
Customer Support
For questions or to confirm compatibility, please email customerservice@marinepartswarehouse.com .
Please include your engine model and serial number to verify the correct oil before ordering.
