Sierra 9391 Yamaha 4-Stroke Oil Change Kit
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Complete Oil Change Kit for Yamaha 4-Stroke Outboards
Keep your Yamaha 4-stroke outboard running at its best with this all-in-one oil change kit from Sierra. Everything you need for a full service interval is included — no hunting for compatible parts separately.
What's Included
- Sierra Premium Blend 4-Stroke Marine Engine Oil — 10W-30
- Compatible replacement oil filter
Best Use Case
Ideal for routine maintenance on Yamaha 4-stroke outboard engines. This kit is the go-to choice for boaters who perform their own seasonal or annual oil changes and want OEM-equivalent performance without the OEM price. The 10W-30 viscosity is well-suited for a wide range of operating temperatures, making it a reliable choice for both warm-weather cruising and shoulder-season use.
Key Features
- Premium blend formula designed for 4-stroke marine engines
- Meets or exceeds Yamaha OEM specifications
- Replaces Yamaha part LUB-MRNMD-KT-10
- Convenient kit format — oil and filter together
Related Products
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.