Synthetic Marine Engine Oil

10W-30 & 10W-40

AMSOIL Synthetic Marine Engine Oil is a premium synthetic formulation designed to withstand the heat and stress of high-rpm operation and deliver excellent wear protection. It protects against rust and corrosion during periods of inactivity and long-term storage to keep your engine protected, even when it’s not running. Synthetic Marine Engine Oil is perfect for hardcore anglers and boating enthusiasts who demand the best protection for their marine engines.

Fights Engine

Wear

AMSOIL Synthetic Marine Engine Oil's naturally strong base oils resist viscosity loss due to mechanical shear. The oil develops a tough lubricating film that protects engine parts, even in high-heat, high-rpm conditions that breakdown other oils. Synthetic Ma-rine 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 extending the lives of marine engines.

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.

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

NMMA

Certified

Synthetic Marine Engine Oil is certified by the National Marine Manufacturers Associa-tion (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-30 — FC-W (CAT)® Registration Number: FC-00833T
10W-40 — FC-W (CAT)® Registration Number: FC-00850T

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Use in gasoline-fueled four-stroke inboards, outboards, inboard/outboards 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
AMSOIL Synthetic Marine Engine Oil

10W-30 (WCT) 10W-40 (WCF)
Kinematic Viscosity @ 100ºC, cSt (ASTM D445) ............................................. 11.8 14.1
Kinematic Viscosity @ 40ºC, cSt (ASTM D445) ............................................... 75.6 93.3
Viscosity Index (ASTM D2270) ......................................................................... 151 155
Pour Point ºC (ºF) (ASTM D97) ......................................................................... -39 (-38) -38 (-36)
Flash Point ºC (ºF) (ASTM D92) ........................................................................ 230 (446) 240 (464)
High-Temperature/High-Shear Viscosity (ASTM D5481) .............................. 3.5 4.2
Four-Ball Wear Test
(ASTM D4172 @ 40kgf, 150ºC 1800 rpm, 1hr), Scar, mm ....................... 0.41 0.40
NOACK Volatility, % weight loss (g/100g) (ASTM D5800) .............................. 7.8 7.5
Total Base Number ........................................................................................... 7.9 7.9
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.
AMSOIL 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 benfits. AMSOIL does not support extended drain intervals where oils have been mixed.Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Marine Engine oil.

Reviews

Improved power

Comments about AMSOIL 10W-40 Synthetic Marine Engine OilI recently started using Amsoil Marine in our Yamaha Jet Boat. With the boat being 6 years old, I immediately notice a quieter ride and was most impressed by the 5-7% thrust improvement (3-5mph). We will be using it in our jet skis next

Best for my boat!

I have been using this in my Yamaha 150 4 stroke for over 10 years. I recently replaced the balancer and had the opportunity to inspect the engine internally from the bottom end. I observed absolutely zero wear on visible internal engine parts and the engine was so clean inside it looked brand new!

Your Service Title Here

Great for Sea-DooWorks great in my supercharged Sea-Doo. No issues with supercharger slipping, motor runs very smoothly. Will continue to use this.

I will buy this again

Great product, love it.

Simply the Best

We run our sea doos hard and this oil has never let us down. For supercharged skis there are no friction modifiers and it's JASO MA2 which is safe for our superchargers. I've been running amsoil in all my products for a while now and won't run anything else.