Sierra 25W40 4-STROKE Outboard - 25W40 Syn Blend 4ST O/b Oil 4L | 18-9440-3
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sierra SAE 25W-40 synthetic-blend marine engine oil is formulated for four-stroke outboard lubrication.
Key Specifications
- Manufacturer part number: 18-9440-3
- Container: 4 litres
- Viscosity: SAE 25W-40
- Synthetic blend; NMMA FC-W formulation
Intended Use & Application
Use only when your engine's service manual calls for the stated viscosity and oil specification. Fill to the specified level.
Parts Desk Insight
Engine oil grade and catalyst requirements matter more than matching the brand on the cowling.
Sold individually. Also available in cases of 4.
Freight Alert: In Quantity
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.