Sierra 25W-40 FC-W Catalyst Compatible 4-Stroke Marine Engine Oil – 55 Gal Drum
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Sierra 25W-40 FC-W Catalyst Compatible 4-Stroke Marine Engine Oil – 55 Gal Drum
Designed for modern four-stroke marine engines — with or without emission catalyst systems — this 25W-40 engine oil meets NMMA FC-W Catalyst Compatible certification requirements. It's built for the demanding operational and environmental conditions that recreational and commercial marine engines face: extended hours, temperature swings, humidity, and saltwater exposure.
The 55-gallon drum format is ideal for marinas, service shops, and fleet operators who perform high-volume oil changes and want consistent, professional-grade protection across every engine they service.
Key Benefits
- NMMA FC-W Catalyst Compatible — safe for use in 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: 55 Gallons (drum)
- Engine Type: 4-Stroke (gasoline inboard & sterndrive)
- Application: Inboard & Sterndrive engines with or without catalyst systems
Related Products
- 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 55-gallon drum is the right format for marinas, boat dealerships, and service facilities doing volume engine oil changes — not a typical single-boat purchase. If you're servicing your own vessel, the 1-quart format is the practical choice. The 25W-40 FC-W Catalyst Compatible spec is particularly important for newer sterndrive and inboard engines (MerCruiser, Volvo Penta) that use catalytic converter systems — using a non-catalyst-compatible oil in these engines can damage the catalyst over time. If your engine manual specifies FC-W Catalyst Compatible, this is the correct oil. Always verify your engine's oil specification before ordering in bulk.
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.