Catalyst Marine Engine 5 Quart 25W-40 | Sierra 18-9400CAT-4

Catalyst Marine Engine 5 Quart 25W-40 | Sierra 18-9400CAT-4

Engineered specifically for 4-stroke marine engines equipped with catalyst emission systems, this premium 25W-40 blend delivers the advanced protection your vessel demands. Sierra's catalyst-compatible formula ensures optimal performance while safeguarding your engine's emission control components, keeping your boat running smoothly and reliably season after season.

• Sierra premium blend catalyst compatible inboard engine oil
• SAE 25W-40
• 5 quart jug
• Recommended for use with inboard and I/O marine engines with catalyst exhaust systems
• Meets the requirements of modern 4-stroke recreational engines with or without emission catalyst systems
• Developed specifically for the marine environment and the high running stresses marine engines encounter
• Protects internal engine components from rust, corrosion, and from sticking piston rings
• Premium blend features high detergency, anti-oxidants, and antiwear proprties
• ZDDP anti-wear additive prevents phosphorus depletion and extends the emission catalyst life
• Exceeds all 4-stroke requirements including FC-W and FC-W Cat compatible
• NMMA FC-W certified
• Replaces Bel-Ray 99730-BT4