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AMSOIL Products for 4-cycle Gasoline-Powered Applications

Treat Your Boat To The Finest In Marine And Watercraft Lubricants - AMSOIL

Engine Oil

Formula 4-Stroke® Marine Synthetic Motor Oil 10W-30 (WCT) and Formula 4-Stroke® Marine Synthetic Motor Oil 10W-30 (WCF) are formulated specifically for use in 4-stroke gasoline-fueled engines used in marine applications. They offer unsurpassed wear protection, viscosity stability, low volatility and excellent low temperature fluidity. AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oils meet the “Warranty Certified” status of engine manufacturers. They are recommended for use in 4-stroke outboard motors including Honda, Yamaha, Mercury, Suzuki, Johnson-Evinrude (BRP) and more. Also excellent for use in marine inboard/outboard engines, marine inboard power plants and personal water craft.


Performance Improver Gasoline Additive (API) dissolves and removes fuel system deposits and other contaminants for improved power and overall performance in fuel injected and carbureted gasoline engines. AMSOIL PI also reduces PCV and EGR system deposits, reduces exhaust emissions and improves engine starting, idling and response.

Gasoline Stabilizer (AST) keeps gasoline and diesel fuel from oxidizing and deteriorating, prolonging its storage life. Gasoline Stabilizer inhibits the formation of varnish and gum, which helps prevent poor injector and engine performance.

AMSOIL Engine Fogging Oil’s (FOG) superior film retention provides stored equipment with long-term protection against corrosion and dry starts, extending engine life and reducing operating expenses. Its aerosol spray formulation offers easy and clean applications, while reaching more components and offering complete distribution of the oil, something especially beneficial in applications with horizontal cylinder orientation such as outboard motors.

Engine Life Increases 500 Percent

More than 60,000 tourists annually visit Alpine Canyons, South Island, New Zealand for high-speed thrills on Shotover Jet Ltd jetboats.

The tourist trade is tough service for the boats. The Chevrolet 454 cu in V-8 engined jetboats are in service 365 days a year, making up to 28 high speed river trips a day. The boats develop maximum torque at extremely low engine operating temperatures, due to the cooling effect of the snow-fed river water they draw. How does Shotover protect these hard working engines?

With AMSOIL Synthetic Motor Oils and AMSOIL By-Pass Oil Filters. Before converting the boats to AMSOIL motor oil and filters and propane fuel, oil change intervals were at 25 hours and engine life in the 500 hour range. The propane fuel, AMSOIL motor oil and AMSOIL by-pass filter combination provides 400-hour oil change intervals and engine life up to 2500 hours - that's 16 times greater oil change intervals and five times greater engine life - a huge savings for Shotover Jet Ltd.

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