Sierra 25W-40 FC-W Catalyst Compatible 4-Stroke Marine Engine Oil – 5 Qt
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Sierra 25W-40 FC-W Catalyst Compatible 4-Stroke Marine Engine Oil – 5 Qt
The 5-quart jug is the practical choice for a full inboard or sterndrive oil change — enough volume to complete most single-engine services without leftover waste. This 25W-40 oil meets NMMA FC-W Catalyst Compatible certification, making it safe for use in modern four-stroke marine engines with or without emission catalyst systems.
Built on premium base stocks with an advanced additive package, it delivers the wear protection, corrosion resistance, and thermal stability that inboard and sterndrive engines demand across a full season of use.
Key Benefits
- NMMA FC-W Catalyst Compatible — safe for engines with or without emission catalyst systems
- Industry-leading wear protection and deposit control for long engine life
- Enhanced detergent and dispersant properties prevent sludge formation
- Minimizes internal engine corrosion in freshwater and saltwater environments
- Reduces engine friction for improved efficiency
- Premium base stocks resist thermal and oxidative breakdown under sustained load
- Highly shear-stable viscosity prevents excessive thinning at operating temperature
- Advanced ZDDP anti-wear additive technology protects against phosphorus depletion and extends catalyst life
Specifications
- Viscosity: 25W-40
- Certification: NMMA FC-W Catalyst Compatible
- Volume: 5 Quarts
- Engine Type: 4-Stroke (gasoline inboard & sterndrive)
- Application: Inboard & Sterndrive engines with or without catalyst systems
Related Products
- Sierra 25W-40 FC-W Catalyst Compatible Marine Engine Oil – 55 Gal Drum
- Sierra Synthetic Blend 25W-40 FC-W Marine Engine Oil – 1 Qt
- Sierra Synthetic Blend 25W-40 FC-W Marine Engine Oil – 55 Gal Drum
- Sierra Synthetic Blend 10W-30 FC-W Outboard Engine Oil – 1 Qt
Parts Desk Insights
The 5-quart size is the sweet spot for a single inboard or sterndrive oil change — most MerCruiser and Volvo Penta engines take between 4 and 6 quarts, so this covers the majority of services with minimal waste. If you're doing multiple engines or want to stock up for the season, the 55-gallon drum is available for volume purchasing. The FC-W Catalyst Compatible spec matters if your engine has a catalytic converter — common on newer MerCruiser and Volvo Penta sterndrives. Using a non-catalyst-compatible oil in these engines can degrade the catalyst over time. Always confirm your engine's oil specification in the owner's manual before purchasing.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.