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YamaLube 20W-40 Marine Oil Nmma FCW 1-Quart

YamaLube 20W-40 Marine Oil Nmma FCW 1-Quart

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YamaLube 20W-40 Marine Oil Nmma FCW 1-Quart.

YamaLube 4M Four Stroke Outboard Oil 20W-40

YamaLube 20W-40 is designed for maintaining viscosity in 4 stroke outboard engines in marine environments. NMMA FC-W certified, this oil features rust inhibitors that helps keep you moving smoothly and increasing engine life. Yamalube utilizes anti-friction protection to help promote efficient fuel economy and increased performance. Additionally, Yamalube 4M FC-W has the best blend of anti-foam technology available. This is important, as foaming reduces lubricity which can lead to engine wear and, over time, failure.


  • Mineral-based four-stroke outboard engine oil.
  • Top-tier NMMA FC-W certified oil.
  • Formulated to protect your engine in the most demanding marine conditions.
  • Developed to replace the 10W-30 in warmer climates. 
  • Meets or exceeds OE specifications for Outboard Oil.
  • Advanced additive package to prevent rust and corrosion, breakdown under high RPM and maximum load conditions.

Yamalube 20W-40 Oil is NMMA FC-W certified. Oils that earn this certification have been proven to provide the performance and quality demanded by today's advanced four stroke outboard technology. These oils stand up to extended full-throttle operation, high loads, and the salt and moisture-rich air found in harsh marine environments.

Sizes Available:

  • Quart
  • Gallon
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