Amsoil 10W-40 Formula 4-Stroke® Marine Synthetic Oil 3.78L

Specially engineered for marine applications. Durable formulation protects in severe conditions, from all-day trolling to high-rpm operation. Heavily fortified with advanced additives designed to prevent deposits, rust and corrosion. Use in gasoline-fueled four-stroke inboards, outboards and personal watercraft.
FIGHTS ENGINE WEARNaturally strong base oils resist viscosity loss due to mechanical shear.Develops a tough lubricating film that protects engine parts, even in high-heat, high-rpm conditions that break down other oils.Contains robust anti-wear additives that further reduce wear in metal-to-metal contact regions, guarding against compression loss for maximum power and engine life.
EXCELLENT ANTI-RUST PERFORMANCEFortified with potent inhibitors that guard against damaging rust and corrosion.Protects engines during use and during inactivity or long-term storage.
NMMA CERTIFIEDCertified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors.Demonstrates outstanding performance and meets the requirements of the NMMA FC-W Catalyst Compatible specification, which is backward-compatible with the FC-W specification.