Description

Sierra’s 25W-40 Catalyst Engine Oil is approved for all 4-stroke applications, including outboards, sterndrives, and inboard engines. It is formulated to offer maximum corrosion protection and includes advanced lubrication for extended engine life and wear protection. It prevents phosphorous depletion and extends the emission catalyst life. NMMA FC-W Certified. Exceeds all 4-stroke requirements, including FC-W and FC-W Cat Compatible.
Meets modern recreational 4-stroke engines with or without emission catalyst systems
Approved for all 4-stroke applications including outboard, sterndrive and inboard engines
Formulated to offer maximum corrosion protection
Advanced lubrication for extended engine life and wear protection
Prevents phosphorous depletion and extends the emission catalyst life