Sierra Marine 18-9400CAT-5 Premium Blend 4-Stroke Catalyst Compatible Marine Engine Oil – 25W-40 FC-W (1.25 Gallon / 5 Quart Jug)

Sierra 25W-40 FC-W Catalyst Compatible oil is the go-to choice for modern 4-stroke sterndrive and inboard engines equipped with catalytic converters (2007+ MerCruiser, Volvo Penta, Ilmor, Indmar, PCM, etc.). Using a special low-phosphorus ZDDP formula, it delivers all the protection of Sierra’s legendary marine oil while preventing catalyst poisoning and extending emissions system life.

Key Features & Benefits

• NMMA FC-W Catalyst Compatible certified
• Thermally stable ZDDP anti-wear additives prevent phosphorus depletion and protect catalysts
• Superior corrosion protection — perfect for saltwater and seasonal storage
• High detergency keeps pistons clean and prevents ring sticking
• Excellent wear protection under heavy load and high-RPM operation
• Outperforms automotive oils in the marine environment
• Safe for use in ALL 4-stroke marine engines (with or without catalysts)

Specifications

• Viscosity → SAE 25W-40
• Type → Premium mineral blend (conventional) – Catalyst Compatible formulation
• Volume → 1.25 U.S. Gallons (5 Quarts / 4.73 L)
• Container → Plastic jug with handle and pour spout
• Sold as → Single jug
• Approximate shipping weight → 11 lbs