Get the Best Outboard Marine Engine Oil

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

Product Details and Specifications

Why Amsoil for your outboard marine engine?

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.

Are you ready to experience unparalleled performance and durability for your marine engine? Look no further than our specially engineered formulation, meticulously crafted to safeguard your vessel in even the harshest conditions. 

From all-day trolling to high-rpm operation, this durable solution stands as your unwavering ally, fortified with advanced additives designed to prevent deposits, rust, and corrosion. Bid farewell to the worries of engine wear, as our naturally strong base oils resist viscosity loss, developing a tough lubricating film that protects engine parts, even in the most extreme heat and high-revving scenarios.

But that’s not all – our robust anti-wear additives take protection to new heights, reducing wear in metal-to-metal contact regions, ensuring maximum power and prolonging your engine’s lifespan. Potent inhibitors stand guard against damaging rust and corrosion, shielding your engine during use, inactivity, or long-term storage.

Certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors, our formulation has proven its mettle, demonstrating outstanding performance and meeting the stringent requirements of the NMMA FC-W Catalyst Compatible specification.

Don’t settle for anything less than the best for your marine engine. Unleash the power of uncompromising protection and experience the confidence that comes with our cutting-edge solution. Upgrade your vessel today and conquer the waters with unwavering reliability.

AMSOIL Marine Engine Oil is engineered to provide superior performance and excellent protection against wear, rust and corrosion in high-stress, high-rpm gasoline-powered marine engines. It is available in 10W-30, 10W-40, 25W-40 viscosities as part of our complete marine product line. We also have Amsoil 15w-40 heavy-duty diesel and marine oil which is recommended for applications specifying API CI-4+ and prior specifications. It is also available in a 2-stroke marine oil which is excellent for Evinrude* E-TEC* factory-lean setting. Search the correct oil for your outboard engine by clicking below. 

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Updated and reviewed on June 2, 2024 by Joseph Feghali, Authorized Amsoil dealer.