Sierra 25W-40 4-Stroke Marine Engine Oil - 1 Quart
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sierra premium 25W-40 4-stroke marine engine oil engineered for superior protection and performance in marine gasoline engines. This high-quality oil provides excellent lubrication, wear protection, and corrosion resistance for demanding marine applications.
Key Features:
- 25W-40 viscosity for optimal protection across temperature ranges
- Formulated specifically for 4-stroke marine engines
- Superior wear protection and corrosion resistance
- Marine-grade additives for saltwater environments
- Meets or exceeds marine engine manufacturer specifications
Applications:
Ideal for 4-stroke marine gasoline engines including outboards, sterndrives, and inboards. Suitable for both freshwater and saltwater use.
Usage Note:
Follow engine manufacturer's recommended oil change intervals. Check oil level regularly. Dispose of used oil properly at authorized recycling centers.
Shipping information
In-stock OEM parts: ship same or next business day.
Other in-stock products: ship within 1–3 business days.
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.