Sierra 118-9420CAT-3 10W-30 FC-W 4-Stroke Catalyst Marine Engine Oil Gallon

Sierra 118-9420CAT-3 is a premium 10W-30 FC-W certified 4-stroke marine engine oil designed specifically for outboard motors, stern drives, and inboard gasoline marine engines. This gallon-sized container provides high-performance lubrication with advanced catalyst-compatible formulation.

Key Features:

• FC-W (Four-Cycle Water-Cooled) certified for marine gasoline engines
• 10W-30 viscosity grade for excellent all-season performance
• Catalyst-compatible formulation protects emission control systems
• Advanced additive package prevents rust, corrosion, and wear
• Exceeds NMMA FC-W specifications for 4-stroke marine engines
• One gallon (128 oz) container for convenient oil changes

This marine-grade engine oil provides superior protection in the harsh saltwater environment while maintaining optimal engine performance. The catalyst-compatible formula ensures compatibility with modern marine engines equipped with emission control devices, preventing catalyst poisoning and extending engine life.