Synthetic blend 25W-40 engine oil is formulated for stern drive & inboard marine engines.

• Sierra synthetic blend inboard engine oil
• SAE 25W-40
• 5 quart jug
• Recommended for gasoline inboard and I/O engines
• 4-stroke oil is a blend of premium grade synthetic and mineral based stock with highly refined additives
• 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
• Features high detergency, anti-oxidants, and antiwear proprties
• Prevents thermal breakdown under high RPM’s, extreme temperatures, and high load conditions
• NMMA FC-W certified/API-SL