Sierra 95512 10W-40 FC-W Synthetic Blend 4-Cycle Marine Engine Oil – 1 Qt.
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Sierra 95512 10W-40 FC-W Synthetic Blend Marine Engine Oil – 1 Qt.
A 1-quart bottle of Sierra’s 10W-40 synthetic blend marine engine oil, meeting both NMMA FC-W and API SL certifications. Formulated for 4-cycle outboard and inboard engines operating without a catalytic converter, this oil maintains a stable viscosity film across a wide temperature range while providing elevated rust and corrosion inhibitors for both saltwater and freshwater environments. The synthetic blend base delivers strong shear stability and high-load bearing protection under sustained engine use.
The quart format is ideal for topping up oil between services, carrying a spare on board, or completing a partial oil change on a small-displacement engine.
Specifications
- Part Number: 95512
- Viscosity: 10W-40
- Certification: NMMA FC-W / API SL
- Engine type: 4-cycle outboard and inboard (non-catalytic converter)
- Volume: 1 US quart (~946 mL)
- Base: Synthetic blend
- Weight: 0.9 kg (2.0 lb)
Parts Desk Insights
Best use case: The quart is the right pick for topping up oil mid-season, keeping a spare aboard for longer passages, or performing a full oil change on a small single-cylinder 4-stroke kicker or auxiliary outboard. For a full oil change on a mid-size or larger 4-stroke outboard, the Sierra 95513 10W-40 FC-W Oil – 1 Gal. is the more practical choice. High-volume shop and fleet users should consider the Sierra 95517 10W-40 FC-W Oil – 55 Gal. Drum for the best per-litre value. Not intended for 2-stroke engines or engines equipped with catalytic converters.
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.