This OEM Mercury 25W40 Synthetic Blend Engine Oil (1 Gallon) is the factory-approved oil for all Mercury and MerCruiser 4-stroke engines.
Formulated with a precise balance of synthetic and premium mineral base stocks, it provides superior protection against corrosion, viscosity breakdown, and thermal stress under high-load marine conditions.
The 25W40 viscosity grade ensures consistent oil film strength across extreme temperatures, reducing wear and extending engine life.
Replaces OEM part number 8M0078630 and is compatible with all Mercury 4-Stroke Outboards and MerCruiser inboards requiring FC-W certified oils.
Product Features
- Manufacturer: Mercury Marine (OEM)
- Application: Mercury 4-Stroke Outboards and MerCruiser Inboard Engines
- Type: Synthetic Blend Marine Engine Oil
- Viscosity: 25W40
- Size: 1 Gallon (128 oz)
- OEM Part #: 8M0078630
- Cross Reference #: 18-9440-4P, 8M0051369, 8M0061369, 8M0061424, 8M0078623, 8M0078630, 8M0078636, 8M0078642, 8401661, 845282, 8452821, 857493A01, 857493A1, 857495A01, 857495A1, 858053KC1, 858053K01, 858053QC1, 858053Q01, 858056KC1, 858056K01, 858056QC1, 858056Q01, 858088KC1, 858088K01, 858088Q01, 883723K01, 883723Q01, 883725K01, 883725Q01
- Performance: Superior wear protection, anti-foam, and corrosion resistance
- Certification: NMMA FC-W Certified
- Condition: 100% brand-new genuine Mercury OEM lubricant
- Warranty: Covered under Mercury Marine’s limited parts warranty
Additional Information
Note: Ideal for high-demand 4-stroke marine engines, including MerCruiser, Verado, and SeaPro models.
Provides enhanced protection against rust and moisture intrusion, even during off-season storage.
Do not mix with automotive oils; use only Mercury-approved lubricants for optimal performance.
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 proper oil selection before ordering.
