Sierra 18-9558CAT-2 5W-30 Full Synthetic FC-WCAT Marine Engine Oil 1 Quart

Sierra 18-9558CAT-2 is a premium full synthetic 5W-30 marine engine oil specifically formulated for ultra-high performance in gasoline inboard and sterndrive engines equipped with catalytic converters. This advanced formula meets or exceeds both FC-W Catalyst (FC-WCAT) and FC-W performance specifications, ensuring optimal protection for modern marine engines with emission control systems.

Key Features:

• Full synthetic formulation with premium base stocks and advanced additive technology
• FC-WCAT certified for use in marine engines with catalytic converters
• Meets or exceeds FC-W catalyst and FC-W performance specifications
• Suitable for use with fuels of any sulfur level
• Recommended for gasoline inboard and sterndrive engines
• One quart bottle for convenient service intervals

This ultra-high performance engine oil utilizes industry-leading synthetic base stocks and a balanced additive package to deliver superior lubrication, wear protection, and engine cleanliness in the demanding marine environment. Ideal for tow boats, cruisers, and other gasoline-powered marine applications requiring catalyst-compatible oil.