10W-30 FC-W 4-Stroke Catalyst Oil, Qt | 18-9420CAT-2

Sierra 18-9420CAT-2 4-stroke catalyst oil is approved for all 4-stroke applications including outboard, sterndrive, and inboard. It provides superior corrosion protection under extreme conditions as well as industry leading deposit control.

• Meets requirements of modern 4-stroke recreational engines with or without emission catalyst systems
• Approved for all 4-stroke applications including Outboard, Sterndrive and Inboard
• Exceeds all 4-stroke requirements including FC-W and FC-W Cat Compatible
• Provides superior corrosion protection under extreme conditions
• Industry leading wear protection and deposit control
• Capitalizing on "ZDDP" anti-wear additive technology
• Prevents phosphorous depletion and extends the emission catalyst life
• NMMA FC-W Certified