Sierra 96902 10W-30 FCW Synthetic 4-Stroke Marine Oil — 1 Qt
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Full-Synthetic 4-Stroke Marine Engine Oil — Outboard & Sterndrive
Sierra 96902 is a full-synthetic 10W-30 marine engine oil formulated specifically for 4-stroke outboard and sterndrive engines. Built on a synthetic base oil with a precision-balanced additive system, it exceeds NMMA FC-W® certification requirements — going beyond the standard that conventional oils are designed to merely meet.
The result is stronger protection across a wider operating range: faster lubrication at cold start, superior stability at high temperatures, and greater resistance to oxidation that helps reduce oil consumption over time.
Key Benefits
- Exceeds NMMA FC-W® Certified standards — not just meets them
- Synthetic base oil for superior film strength and thermal stability
- Faster lubrication at cold start — critical protection during the first seconds of engine operation
- Excellent high-temperature protection for hard-working marine engines
- Greater oxidation resistance helps reduce oil consumption between changes
- Recommended for both outboard and sterndrive 4-stroke applications
Also Available
- Sierra 94202 10W-30 FCW 4-Stroke Outboard Oil — 1 Qt — conventional formula option
- Sierra 9394 Oil Change Kit — complete service kit with filter, gasket, funnel, maintenance sticker, and shop towel
Parts Desk Insights
This is the right recommendation for customers who want to step up from conventional oil — particularly those running higher-hour engines, operating in extreme temperature ranges, or extending service intervals. Best use case: performance-oriented boat owners, year-round operators, and anyone whose engine manufacturer recommends or approves a full-synthetic FC-W oil. The synthetic upgrade is an easy conversation starter at the counter: the price difference over conventional is modest, and the protection story sells itself.
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.