Sierra's Premium Blend 25W-40 catalyst engine oil is specially formulated to meet the needs of 4-stroke marine engines with catalyst emission systems.
- 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