AMSOIL 10W-40 100% Synthetic Marine Engine Oil

Description

AMSOIL 10W-40 100% Synthetic Marine Engine Oil

Fights Engine Wear

AMSOIL 10W-40 100% 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 break down other oils. AMSOIL 10W-40 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 10W-40 100% 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.

• Excellent high-stress, high-rpm endurance
• Increased rust and corrosion protection
• NMMA FC-W Catalyst Compatible

NMMA Certified

AMSOIL 10W-40 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.

• 10W-40 ‐FC-W (CAT) Registration Number: FC-00850T

APPLICATIONS

Use in gasoline-fueled four-stroke inboards, outboards, inboard/outboards, supercharged watercraft engines, and personal watercraft, including those made by Honda* Mercury* Yamaha* Johnson/Evinrude* Bombardier/BRP* Suzuki* Nissan* Tohatsu* OMC* Volvo-Penta* Mercruiser* Chevrolet* and Ford.*

NMMA FC-W Catalyst Compatible – API SM, JASO MA

Service Life

• Four-stroke outboard motors and personal watercraft applications: Due to potential fuel dilution or water contamination, change oil at the engine or watercraft manufacturer-recommended interval.
• Inboard and I/O applications: Change oil at two times the engine manufacturer recommended interval or one year, whichever comes first.

Compatibility

AMSOIL 10W-40 100% Synthetic Marine Engine Oil is compatible with other synthetic and conventional motor oils. Adding other oils, however, will shorten the life expectancy of AMSOIL motor oils and reduce their performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL 10W-40 Synthetic Marine Engine oil.

WARRANTY SECURE

AMSOIL 10W-40 100% Synthetic Marine Engine Oil is Warranty Secure, keeping your factory warranty intact. AMSOIL Synthetic Marine Engine Oil is a high-performance replacement for vehicle manufacturer-branded products and is also backed by the AMSOIL Limited Warranty. For details, visit AMSOIL.com/warranty/.

Health & Safety

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS). 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.

* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

Why Choose AMSOIL Over Conventional Marine Oils?

Unlike many traditional marine oils such as Quaker State or Valvoline, AMSOIL 10W-40 Synthetic Marine Engine Oil maintains viscosity better under high-rpm and high-heat conditions, thanks to its fortified synthetic base. While conventional oils often thin out and fail to protect critical components during intense operation, this AMSOIL formula holds strong, reducing engine wear more effectively. Additionally, its rust and corrosion inhibitors perform better than those found in common competing brands, providing lasting protection during engine inactivity and storage. These advantages make AMSOIL a practical choice for operators prioritizing durability and long-term engine health.