AMSOIL 10W-40 Marine Oil: The Ultimate Protection for Your Engine
Introducing AMSOIL Synthetic Marine Engine Oil
AMSOIL 10W-40 Marine Oil is a top-quality synthetic oil. It is made to handle the heat and stress of high-rpm operations. This marine oil offers great wear protection. It also protects against rust and corrosion during storage. It’s perfect for serious anglers and boating fans who need the best for their marine engines.
Fighting Engine Wear
AMSOIL Synthetic Marine Engine Oil has strong base oils. They resist viscosity loss due to mechanical shear. This oil creates a tough lubricating film. It protects engine parts in high-heat, high-rpm conditions. The oil also contains strong anti-wear additives. These reduce wear in metal-to-metal contact areas. This helps maintain maximum power and engine life.
Superior Anti-Rust Performance
Good rust protection doesn’t come naturally to motor oil. AMSOIL 10W-40 Marine Oil is designed with powerful inhibitors. These guard against damaging rust and corrosion. They protect engines during use and while inactive or in long-term storage.
NMMA Certified
AMSOIL Synthetic Marine Engine Oil is certified by the National Marine Manufacturers Association (NMMA). It is used in four-stroke outboard motors. This high-quality oil shows excellent performance. It meets NMMA FC-W Catalyst Compatible specifications. This is also backward-compatible with the FC-W specification.
Compatibility and Application
AMSOIL 10W-40 Marine Oil is for gasoline-fueled four-stroke inboards, outboards, and more. Use it in Honda, Mercury, Yamaha, and other brands’ engines. It is compatible with other synthetic and conventional motor oils. Mixing oils, however, reduces AMSOIL oil’s life expectancy and performance. AMSOIL doesn’t support extended drain intervals with mixed oils. Aftermarket oil additives aren’t recommended with this oil.
Service Life and Warranty Secure
For four-stroke outboard motors and personal watercraft, change oil as recommended by the manufacturer. For inboard and I/O applications, change oil at twice the manufacturer-recommended interval or one year, whichever comes first. AMSOIL Synthetic Marine Engine Oil is Warranty Secure. It keeps your factory warranty intact. It is a high-performance replacement for manufacturer-branded products. It is also backed by the AMSOIL Limited Warranty. For details, visit AMSOIL.com/warrantysecure.
Health and Safety
This product isn’t expected to cause health concerns when used as intended. The Safety Data Sheet (SDS) has recommendations. An SDS is available online at AMSOIL.com or upon request at (715) 392-7101. Keep out of reach of children. Recycle used oil and bottle.
Technical Properties
AMSOIL 10W-40 Marine Oil has excellent technical properties. It performs well in various tests, such as kinematic viscosity, viscosity index, pour point, flash point, and more. This oil has a low Noack volatility and a total base number of 7.9.
Why Choose AMSOIL 10W-40 Marine Oil?
In conclusion, AMSOIL 10W-40 Marine Oil is the perfect choice for your marine engine. It offers excellent protection against wear, rust, and corrosion. It is certified by NMMA and is compatible with various engine brands. With its Warranty Secure feature, you can trust that your engine’s warranty will remain intact. For the best performance and protection for your marine engine, choose AMSOIL 10W-40 Marine Oil.
Where to Buy AMSOIL 10W-40 Marine Oil?
AMSOIL products and Dealership information are available from your local full-service AMSOIL Dealer. Visit AMSOIL.com for more information and to find a dealer near you.
Experience the Difference with AMSOIL Synthetics
Invest in the future of your marine engine by using AMSOIL 10W-40 Marine Oil. Not only will you be providing top-notch protection against wear and tear, but you’ll also be ensuring a longer engine life. Don’t settle for less; choose AMSOIL Synthetics for the ultimate marine engine protection.
How to register as a Preferred Customer
To Register as a Preferred Customer go to From there, click on “Join Now” Choose 6 month or 1 year registration and ad it to your cart. You’ll be directed to continue shopping. Shop for your products, You’ll pay for your registration at checkout. Any other products in your cart will get the preferred Customer discounts price as well.


P.i. Performance Improver
Amsoil P.i. Performance Improver is a powerful gasoline additive designed to enhance engine performance and fuel efficiency. Its advanced formula helps clean fuel injectors, intake valves, and combustion chambers, reducing engine deposits and improving fuel economy. P.i. Performance Improver is compatible with all types of gasoline engines and is easy to use – simply add to your fuel tank before filling up for best results.


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