Sierra 95528 Synthetic Blend 25W-50 FC-W Marine Engine Oil – 1 L
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You have 30 days to request a return. All sale items are final sale.
Sierra 95528 Synthetic Blend 25W-50 FC-W Marine Engine Oil – 1 L
A high-performance synthetic blend engine oil formulated for 4-stroke outboard and inboard marine engines that do not use a catalytic converter. The 25W-50 viscosity grade is engineered to maintain a stable, protective oil film under the high-load, high-temperature conditions common in performance and high-horsepower marine applications.
Sold in 1-litre containers. Case quantities available.
Key Benefits
- NMMA FC-W® certified and API SL rated — meets OEM requirements for non-catalyst 4-stroke outboard and inboard engines
- Synthetic blend formula delivers superior wear protection compared to conventional oils
- Enhanced rust and corrosion inhibitors protect against moisture and salt exposure in marine environments
- High load-carrying capability for demanding, high-RPM operation
- Resists viscosity breakdown under sustained high-temperature conditions
Specifications
- Part Number: 95528 (SKU: 47-95528)
- Viscosity: 25W-50
- Certification: NMMA FC-W®, API SL
- Volume: 1 Litre
- Application: 4-stroke outboard and inboard engines without catalytic converter
Parts Desk Insights
Best use case: The 25W-50 viscosity is best suited for high-horsepower 4-stroke outboards and inboards — particularly older or performance-oriented engines that run hotter and harder than typical recreational motors. This is not catalyst-compatible; if your engine has a catalytic exhaust system, you’ll need an FC-W Catalyst rated oil instead. For a complete oil and filter service solution, see the Sierra 9391 Yamaha 4-Stroke Oil Change Kit as a reference for engine-specific kits available in the Sierra lineup.
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.