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Product Details

Sierra 15W-40 marine diesel engine oil is premium blend with a balanced additive system that exceeds the FC-W requirements for marine engine oils.

Unlike conventional automotive engine oils, Sierra's formulation is specifically developed for the marine environment and will out perform standard diesel automotive engine oils.

Meets the same FC-W and TC-W3 certification standards as OEM brands.

Info & Guides

Technical Information

Diesel Oil Features:

  • Recommended for diesel inboard and sterndrive engines.
  • Superior engine protection during startups, operation and storage.
  • Reduces friction and wear for extended engine life.
  • Longer lubrication effectiveness than mineral oils.
  • Reduces oil consumption and improves fuel economy.
  • This oil meets "API SL/CF diesel specifications".