Sierra 118-9440CAT-4 25W-40 Synthetic Blend Catalyst Marine Engine Oil 5 Quart

Sierra 118-9440CAT-4 is a premium synthetic blend 25W-40 catalyst engine oil specifically formulated for modern 4-stroke marine engines. This advanced oil is designed to meet the unique demands of inboard, sterndrive (I/O), and outboard engines equipped with emission catalyst systems, while also providing superior protection for non-catalyst engines.

Key Features:

• NMMA FC-W Certified and API-SL approved for guaranteed performance and protection
• Specially formulated to prevent phosphorous depletion and extend emission catalyst life
• Developed specifically for the marine environment and the high running stresses marine engines encounter
• Superior corrosion protection shields internal engine components from rust and saltwater damage
• High detergency formula with anti-wear properties and dispersants prevents engine sludge buildup
• Outstanding friction reduction extends engine life and improves performance
• 5-quart (4.7L) container for convenient oil changes

This synthetic blend oil meets the stringent requirements of modern 4-stroke recreational marine engines with or without emission catalyst systems, making it an ideal choice for boat owners who demand reliable protection in harsh marine conditions.