Amsoil Stands Up to Tough Marine Conditions

Made For Marine Environment and Excellent Anti-Rust Performance

Extends Engine Life - Less Like to Acidify and Oxidize

Increase Fuel Efficiency - Smoother Running Motors Use Less Fuel

Awesome additives for increased wear and tear protection, compression loss protection and max engine life and power

Tough as nails protection from viscosity loss due to engine shear

Awesome quality lubrication for rock solid engine parts protection

NMMA Certified – The Right Choice for Outboards

boat oil

Extends Outboard Motor Life

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Product Details and Specifications

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We stand by our products


Fights Engine Wear
AMSOIL Synthetic Marine Engine Oil’s naturally strong base oils resist viscosity loss due to mechanical shear. It develops a tough lubricating film that protects engine parts, even in high-heat, high-rpm conditions that breakdown other oils. Synthetic Marine Engine Oil 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 Performance
Good rust protection is not natural to motor oil; it comes only by design. AMSOIL Synthetic Marine Engine Oil is fortified with potent inhibitors that guard against damaging rust and corrosion. It protects engines during use and during inactivity or long-term storage.

NMMA Certified
AMSOIL Synthetic Marine Engine Oil is certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors. This high-quality oil demonstrates outstanding performance and meets the requirements of the NMMA FC-W Catalyst Compatible specification, which is backward-compatible with the FC-W specification.

We stand by our products


Worth every penny, sometimes I don't use my boat and water can get into the crankcase and this oil protects my engine from break down
boat oil
I am constantly working on the ocean and Amsoil has not let me down, been using it for 15 years already, other oils are good too but this is top quality.
boat oil
changed my oil, impressed at the way it comes out still looking good after hundreds of hours of usage.. friends with Yamaha and Suzuki motors agree
boat oil
I have a jet boat and this oil prevents consumption, engine runs smoothly and I like the fact that this is a full synthetic and not a blend.
boat oil

We also have made in USA synthetic oil for your car, boat, truck, semi tractor, snowmobile, atv, jet-ski, motorcycle or utv. Click on button below to explore the best oil to reduce downtime and repairs.