Sierra 9421CAT3 4-Stroke Synthetic Blend Catalyst Outboard Engine Oil, 10W30, Gal.

• 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
• For use in Mercury 4-Cycle Outboard Engines requiring 10W-30 Sold in case packs only