Protect and lubricate your engine If you need a good oil to protect your motor against wear, rust and corrosion, look no further. The Valvoline 10W 40 4-Stroke Outboard Oil gives excellent lubrication and helps prevent deposits from forming in the combustion chamber. It's recommended for use in high-speed, high load and high engine temperature conditions, in both pre-mix and injection systems. The Valvoline 10W 40 4-Stroke Outboard Oil's self-mixing, special ashless detergents keep deposits to an absolute minimum. In addition, the formulation reduces pre-ignition and plug fouling. Valvoline high performance 4 Stroke Outboard is a synthetic blend 4 stroke motor oil designed to meet the requirements of the NMMA FC-W specification, required by many outboard manufacturers to compliment modern engines. Valvoline 10W 40 4-Stroke Outboard Oil Features: Enhanced protection against wear and corrosion caused by salt water Compatible with leaded and unleaded petrol Provides protection of any 4 stroke engine regardless of age.