Capitalizing on "ZDDP" anti-wear additive technology for maximum corrosion protection, this formula offers advanced lubrication for extended engine life and prevents phosphorous depletion. It is NMMA FC-W CATALYST certified and approved for all 4-...

Sierra 18-9400CAT-4 4-stroke catalyst oil is approved for all 4-stroke applications including outboard, sterndrive, and inboard. It provides superior corrosion protection under extreme conditions as well as industry leading deposit control.
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• 25W-40 Catalyst Oil (55 Gallon)(208L)
Key Features:
• Meets modern recreational 4-stroke engines with or without emission catalyst systems
• Approved for all 4-stroke applications including Outboard, Sterndrive and Inboard...

Sierra 18-9410-2 synthetic oil is a special blend of synthetic base oil and a balanced additive system that exceeds FC-W requirements. Recommended for gasoline and diesel inboard and sterndrive engines. Replaces select Mallory, OMC Stern Drive, and...

• SAE 30 Full Synthetic Oil (55 Gallon)(208L)
Key Features:
• Special blend of synthetic base oil and a balanced additive system that exceeds FC-W requirements
• Recommended for gasoline and diesel inboard and sterndrive...

Sierra 18-9420CAT-2 4-stroke catalyst oil is approved for all 4-stroke applications including outboard, sterndrive, and inboard. It provides superior corrosion protection under extreme conditions as well as industry leading deposit control.
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Capitalizing on "ZDDP" anti-wear additive technology for maximum corrosion protection, this formula offers advanced lubrication for extended engine life and prevents phosphorous depletion. It is NMMA FC-W certified and approved for all 4-stroke...

• 10W-30 Catalyst Oil (55 Gallon)(208L)
Key Features:
• Meets requirements of modern 4-stroke recreational engines with or without emission catalyst systems
• Approved for all 4-stroke applications including Outboard,...