Powerboat Performance
High Performance Synthetic Marine Motor Oils for Gasoline Powered Marine Engines, Inboard and Outboard Motors
"The best oil you can buy for your boat."
- Maximum Performance
- Superior Protection Against Wear
(43% less wear than Mercruiser 25W40)
- Longer Engine Life
- Excellent Rust Protection
- Maximizes Fuel Economy
- Extended Oil Change Intervals
- Reduced Operating Costs
10W40 Marine Motor Oil Replaces:
SAE 25W40, 15W40, 10W40, and SAE 40 Motor Oil
10W30 Marine Motor Oil Replaces:
SAE 5W30, 10W30, and SAE 30 Motor Oil
Click Here for Synthetic Heavy Duty Marine Diesel Motor Oil
AMSOIL 10W-40 4 Stroke Marine Synthetic Motor Oil is a premium quality synthetic formulation engineered for the harsh operating conditions of marine engines. It withstands the intense mechanical action of continuous, high RPM operation to deliver superior performance and protection. Formula 4-Stroke® Marine Synthetic Motor Oil is specially fortified with a heavy treatment of advanced additives that protects marine engines against wear, rust and deposits. It excels in both high horsepower applications and all-day trolling conditions. If you want maximum performance, longer engine life, and reduced operating costs, this is the marine engine oil for you.
Team AMSOIL Offshore Powerboat Racer Bob Teague 2008-2010 World Champion
Superior Protection Against Engine Wear
Marine engines operate under high loads and RPMs for extended periods of time, causing traditional automotive oils to break down and lose viscosity. To ensure good protection, the NMMA set minimum shear stability requirements for FCW. AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil greatly exceeds the FCW shear stability requirements, outperforming competitive marine engine oils to deliver a superior lubricating film. Formula 4-Stroke® Synthetic Oil also contains robust antiwear additives that further reduce wear in metal-to-metal contact regions (see Four-Ball Wear Test graph).
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While automobile engines normally operate at around 2,500 rpm, outboard motors can run twice as fast, requiring greater levels of wear protection and better bearing durability than automobiles. In addition, prolonged idling and low operating temperatures contribute to fuel dilution, further thinning the oil. To ensure adequate protection for their engines, marine engine manufacturers set minimum high temperature/high shear (HTHS) viscosity limits for marine engine oil. AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oils are shear stable and formulated with sophisticated oil additive chemistry, exceeding the HTHS requirements of both the API and NMMA FC-W.
Performance Improver
Gasoline Additive
Increases Fuel Economy Up to 5%
Cleans fuel injectors,
valves, and throttle bodies for improved power, increased fuel economy, and overall performance in gasoline engines.
Reduces exhaust emissions and helps pass emissions tests.
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Excellent Antirust Performance
Marine engines are prone to rust, leading to uncontrolled wear and premature engine failure. However, good rust protection is not natural to engine oil. It comes only by design. Formula 4-Stroke® Marine Synthetic Motor Oil is fortified with a special antirust agent, even more than required to pass stringent NMMA FC-W antirust testing.
4 Stroke Outboard Motor Warranty Certified
Formula 4 Stroke Marine Synthetic Motor Oil is certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors. This high quality oil demonstrates outstanding performance, exceeding the NMMA "FC-W" (Four Cycle Water) specification requirements. Formula 4-Stroke® Marine Synthetic Motor Oil fulfills the warranty requirements of four-stroke outboard motor manufacturers.
- NMMA Registration #FB-30010B 10W-40
- NMMA Registration #FB-30011B 10W-30
Applications
AMSOIL Formula 4-Stroke® Marine Synthetic 10W-40 Motor Oil (WCF) and 10W-30 Motor Oil (WCT) is recommended for gasoline fueled four stroke marine engines, outboard, inboard, inboard / outboard (I/O) and personal watercraft motors.
AMSOIL 10W-40 WCF motor oil is recommended for the following applications whenever an
SAE 10W-40, 15W-40, 25W-40 or straight SAE 40 oil is called for:
AMSOIL 10W-30 WCT motor oil is recommended for the following applications whenever an
SAE 5W-30, 10W-30, or straight SAE 30 oil is called for:
 Be Sure to Get an AMSOIL Long Life Oil Filter
These advanced oil filters have the durability and capacity to last as long as AMSOIL synthetic motor oils. They provide superior filtration and extended filter life. Other filters require more frequent changes.
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Inboard and I/O
Mercruiser, Volvo Penta, OMC, Chrysler Marine, Crusader, Marine Power, Chevrolet, Ford
4 Stroke Outboard Motors
Honda, Mercury, Yamaha, Johnson / Evinrude, Bombardier / BRP, Suzuki,
Nissan, Tohatsu
Personal Watercraft
Honda, Yamaha, Bombardier / BRP ( Sea Doo ), Polaris
Note: AMSOIL Formula 4 Stroke Marine Synthetic 10W40 is recommended for use in place of
25W 40 as specified by Mercury.
Note: AMSOIL Formula 4 Stroke ® Marine Synthetic 10W30 is recommended for use in place of 5W30 as specified by Honda.
NMMA FCW • API SL
High Performance Marine Gear Oil
 Excellent Gear and Bearing Protection even when contaminated with 10% water
Reduced Friction and Wear
Excellent Rust and Corrosion Protection
Long Seal Life
Superior Foam Prevention
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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.
For best results use AMSOIL Ea™ full flow oil filters. They are designed for extended drain intervals, stop smaller particles, have less restriction, and last longer than regular filters
Mixing AMSOIL
AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils will, however, shorten the oil life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.
Aftermarket oil additives are not recommended for use with AMSOIL motor oils.
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TYPICAL TECHNICAL PROPERTIES
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AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCF)
SAE 10W-40, API SL, NMMA FC-W
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Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
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14.1
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Kinematic Viscosity @ 40°C, cSt (ASTM D-445)
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93.8
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Viscosity Index (ASTM D-2270)
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154
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CCS Viscosity, cP @ (°C) (ASTM D2602)
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6871 (-25)
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Flash Point °C (°F) (ASTM D 92)
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234 (453)
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Fire Point °C (°F) (ASTM D 92)
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254 (489)
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Pour Point °C (°F) (ASTM D 97)
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-46 (-51)
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Noack Volatility, % weight loss (g/100g) (ASTM D-5800)
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6.40%
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Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm)
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0.40
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Total Base Number (ASTM D-2896)
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10.5
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HTHS (cP)
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4.6
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Humidity Cabinet Rust (ASTM D-1748)
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Pass
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