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Free Shipping Over $99*
Hassle-Free Returns
Support from Yamaha Parts Specialists

Free Shipping over $99

Orders $99 or more ship free within the contiguous U.S.
May not apply to engines or oversized orders.

Shipping Policy

Free Shipping over $99

Orders $99 or more ship free within the contiguous U.S.
May not apply to engines or oversized orders.

Shipping Policy

45-Day Hassle-Free Returns

Not the right fit? No problem. Send it back within 45 days—no questions, no hassle.

Return Policy

45-Day Hassle-Free Returns

Not the right fit? No problem. Send it back within 45 days—no questions, no hassle.

Return Policy

Expert Support When You Need It

We’re here to make your experience smooth, simple, and stress-free—so you can get back to doing what you love.

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Expert Support When You Need It

We’re here to make your experience smooth, simple, and stress-free—so you can get back to doing what you love.

Talk to a Parts Expert

Yamalube 20W-40 Weight Motor Oil for Four-Stroke Marine Outboard Engines

Shop Yamaha Online Parts' complete selection of Yamalube 20W-40 Weight Motor Oil for four-stroke marine outboard engines to find the right formulation for your Yamaha outboard engine.

Periodic servicing is crucial for keeping your Yamaha outboard operating at its peak. When performing this important task, make sure you use only high-quality engine oil weighted correctly for your specific Yamaha outboard model. Shop Yamaha Online Parts' complete selection of Yamalube 20W-40 Weight Motor Oil for four-stroke marine outboard engines.

Yamalube 4M 20W-40 marine oil

Yamalube 4M 20W-40 is marine-grade four-stroke engine oil formulated for Yamaha outboards and other compatible marine engines. It is designed for high-load marine operation, corrosion protection, anti-foam performance, and consistent lubrication in demanding boating conditions.

Use Yamalube 20W-40 only where that viscosity is recommended for your Yamaha model, climate, and operating conditions. Always confirm the correct oil grade and service interval in your owner’s manual before changing oil.