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PRODUCT DESCRIPTION AMSOIL 10W-40 Formula 4-Stroke® Marine Synthetic Motor Oil (WCF) is a premium quality synthetic formulation engineered for the harsh operating conditions of marine environments. It withstands the intense mechanical action of continuous, high RPM operation to deliver superior viscosity protection. Formula 4-Stroke® Marine Synthetic Motor Oil is specially fortified with a heavy treatment of advanced additives that protects motors against wear, rust and deposits. It excels in both high horsepower applications and all-day trolling conditions.
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
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 FC-W. AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil greatly exceeds the FC-W shear stability requirements, outperforming competitive oils to deliver a superior lubricating film. Formula 4-Stroke® Synthetic Oil also contains robust anti-wear additives that further reduce wear in metal-to-metal contact regions (see Four-Ball Wear Test graph).

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. 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 (see graph).
 Excellent Anti-Rust 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 anti-rust agent, even more than required to pass stringent NMMA FC-W anti-rust testing. Applications AMSOIL Formula 4-Stroke® Marine Synthetic 10W-40 Motor Oil (WCF) is recommended for gasoline fueled four-stroke outboard, inboard, inboard/outboard (I/O) and personal watercraft motors. AMSOIL 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: Four-stroke outboard motors: Honda®, Mercury®, Yamaha®, Johnson®/Evinrude®, Bombardier/BRP®, Suzuki®, Nissan®, Tohatsu®
Inboard and I/O: Mercruiser®, Volvo Penta®, OMC®, Chrysler® Marine, Crusader®, Marine Power®, Chevrolet®, Ford®
Personal Watercraft: Honda®, Yamaha®, Bombardier/BRP® (Sea-Doo®), Polaris®
Note: AMSOIL Formula 4-Stroke® Marine Synthetic 10W-40 is recommended for use in place of 25W-40 as specified by Mercury®.
NMMA FC-W • API SL
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.
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.
Health & Safety This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). MSDS’s are available upon request at 715-392-7101 or on our website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.
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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) |
14.1 |
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Kinematic Viscosity @ 40°C, cSt (ASTM D-445) |
93.8 |
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Viscosity Index (ASTM D-2270) |
154 |
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CCS Viscosity, cP @ (°C) (ASTM D2602) |
6871 (-25) |
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Flash Point °C (°F) (ASTM D 92) |
234 (453) |
| Fire Point °C (°F) (ASTM D 92) |
254 (489) |
| Pour Point °C (°F) (ASTM D 97) |
-46 (-51) |
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Noack Volatility, % weight loss (g/100g) (ASTM D-5800) |
6.40% |
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Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm) |
0.40 |
| Total Base Number (ASTM D-2896) |
10.5 |
| HTHS (cP) |
4.6 |
| Humidity Cabinet Rust (ASTM D-1748) |
Pass |
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PRODUCT DESCRIPTION AMSOIL 10W-30 Formula 4-Stroke® Marine Synthetic Motor Oil (WCT) is a premium quality synthetic formulation engineered for the harsh operating conditions of marine environments. It withstands the intense mechanical action of continuous, high RPM operation to deliver superior viscosity protection. Formula 4-Stroke® Marine Synthetic Motor Oil is specially fortified with a heavy treatment of advanced additives that protects motors against wear, rust and deposits. It excels in both high horsepower applications and all-day trolling conditions.
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-30011B 10W-30
Superior Protection Against Engine WearMarine 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 FC-W. AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil greatly exceeds the FC-W shear stability requirements, outperforming competitive oils to deliver a superior lubricating film. Formula 4-Stroke® Synthetic Oil also contains robust anti-wear additives that further reduce wear in metal-to-metal contact regions (see Four-Ball Wear Test graph). 

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. 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 (see graph).

Excellent Anti-Rust 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 anti-rust agent, even more than required to pass stringent NMMA FC-W anti-rust testing. Applications AMSOIL Formula 4-Stroke® Marine Synthetic 10W-30 Motor Oil (WCT) is recommended for gasoline fueled four-stroke outboard, inboard, inboard/outboard (I/O) and personal watercraft motors. AMSOIL WCT motor oil is recommended for the following applications whenever an SAE 5W-30, 10W-30 or straight SAE 30 oil is called for: Four-stroke outboard motors: Honda®, Mercury®, Yamaha®, Johnson®/Evinrude®, Bombardier/BRP®, Suzuki®, Nissan®, Tohatsu®
Inboard and I/O: Mercruiser®, Volvo Penta®, OMC®, Chrysler® Marine, Crusader®, Marine Power®, Chevrolet®, Ford®
Personal Watercraft: Honda®, Yamaha®, Bombardier/BRP® (Sea-Doo®), Polaris®
Note: AMSOIL Formula 4-Stroke® Marine Synthetic 10W-30 is recommended for use in place of 5W-30 as specified by Honda®.
NMMA FC-W • API SL
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.
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.
Health & Safety This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). MSDS’s are available upon request at 715-392-7101 or on our website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.
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TYPICAL TECHNICAL PROPERTIES |
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AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCT) SAE 10W-30, API SL, NMMA FC-W |
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Kinematic Viscosity @ 100°C, cSt (ASTM D-445) |
11.7 |
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Kinematic Viscosity @ 40°C, cSt (ASTM D-445) |
74.5 |
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Viscosity Index (ASTM D-2270) |
152 |
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CCS Viscosity, cP @ (°C) (ASTM D2602) |
6032 (-25) |
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Flash Point °C (°F) (ASTM D 92) |
236 (457) |
| Fire Point °C (°F) (ASTM D 92) |
258 (496) |
| Pour Point °C (°F) (ASTM D 97) |
-48 (-54) |
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Noack Volatility, % weight loss (g/100g) (ASTM D-5800) |
4.8% |
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Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm) |
0.40 |
| Total Base Number (ASTM D-2896) |
10.5 |
| HTHS (cP) |
3.64 |
| Humidity Cabinet Rust (ASTM D-1748) |
Pass |
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ENGINE FOGGING OIL
Offers superior film retention, providing long-term protection against corrosion and dry starts, extending engine life and reducing operating expenses. Its aerosol spray formulation offers easy and clean applications, while reaching more components and offering better distribution than straight motor oil.
See Pricing Information or Place an Order
Package sizes include:
12-oz. Aerosol Can 12-oz. Aerosol Cans (case of 6)

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Two- and four-stroke recreational vehicles, hand held power equipment, small engines, construction and farm equipment are commonly operated seasonally or infrequently, then stored for long periods of time. During these periods of inactivity, and as a result of fluctuations in ambient temperatures, water vapor can form condensate within the engine. When this condensate comes into direct contact with steel and iron components, it forms surface corrosion on cylinder liners, piston rings, anti-friction bearings and steel/iron contact surfaces on rotational seals. Long periods of storage can also dry out cylinders, often resulting in permanent damage when the equipment is taken out of storage and dry started.
The severity of component distress resulting from extended storage varies, but it is usually not enough to result in immediate component failure. Often, equipment appears to function properly when put back into service, failing shortly thereafter as component distress increases with use. Because the failure doesn’t happen immediately, the equipment owner often does not suspect storage-related problems.
The industry is beginning to recognize the relationship between storage-related corrosion and premature engine failures and performance problems. Most two- and four-stroke motor oils are formulated to have an affinity to engine component surfaces, acting as a barrier that keeps condensate from contacting engine components and forming corrosion. However, the effectiveness of motor oil in this area diminishes with time.
Two common methods are used to extend protection of stored components. One method involves placing motor oil directly on internal engine components, usually by pouring one or two ounces of oil into the engine cylinders through the spark plug holes and manually rotating the engine to distribute the oil. The more effective, easier and cleaner method involves use of an aerosol fogging oil. Because it can be applied through the engine intake or carburetor as it is running, a fogging oil reaches and protects more components than a straight motor oil. In addition, the aerosol nature of fogging oil offers a more complete distribution of the oil than the straight motor oil method, something especially beneficial in applications with horizontal cylinder orientation, such as outboard motors.
A survey of manufacturers in the affected market reveals all have maintenance guidelines for long-term storage of equipment. Forty-three percent indicated special maintenance is required if length of anticipated equipment inactivity exceeds 30 days, while 43 percent indicated a time period of 60 days and 14 percent indicated a time period of 90 days. All recommended the application of additional oil to the engine for long-term storage, and more than half suggested the use of a special fogging oil.
New AMSOIL Engine Fogging Oil offers superior film retention, providing long-term protection against corrosion and dry starts, extending engine life and reducing operating expenses. Its aerosol spray formulation offers easy and clean applications, while reaching more components and offering better distribution than straight motor oil.
AMSOIL Engine Fogging Oil applications include, but are not limited to, motorcycles, snowmobiles, ATV’s, outboard motors, stern drive and inboard marine engines, personal watercraft, lawn equipment, chainsaws, snowblowers, portable generators, hand held power equipment, motor scooters, powered farm equipment, powered construction equipment, cars and trucks.
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Universal Synthetic Marine Gear Lube SAE 75W/80W-90 (AGM) High Performance lubricant engineered to meet the demands of marine applications. AMSOIL Universal Synthetic Marine Gear Lube provides:
- Excellent Gear and Bearing Protection even
when contaminated with 10% water
- Reduced Friction and Wear
- Rust and Corrosion Protection
- Long Seal Life
- Superior Foam Prevention
See Pricing Information or Place an Order
Package sizes include:
13-oz. Tube 13-oz. Tubes (case of 6) 1-Quart Bottle 1-Quart Bottles (case of 12) 5-Gallon Pail 16-Gallon Keg 30-Gallon Drum 55-Gallon Drum |
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PRODUCT DESCRIPTION AMSOIL Universal Synthetic Marine Gear Lube is an exclusive AMSOIL formulation of synthetic base oils and high performance additives that address the specific concerns of marine applications. It is extreme pressure (EP) additive fortified for superior protection of fast accelerating, high torque/horsepower engines. It protects against shock loading from cavitation of heavily loaded engines.
AMSOIL Universal Synthetic Marine Gear Lube is water resistant. It maintains extreme pressure protection even when contaminated with as much as 10% water. It promotes longer seal life, preventing excessive water leakage. AMSOIL Universal Synthetic Marine Gear Lube protects against rust and is compatible with aluminum, copper and brass alloys.
APPLICATIONS AMSOIL Universal Synthetic Marine Gear Lube is recommended for fresh and salt water applications requiring either 75W-90 or 80W-90 viscosity grade and meeting either API GL-4 or GL-5 performance standards.
Examples of AMSOIL Universal Synthetic Marine Gear Lube applications include:
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Outboard Lower Units:
Mercury/Mariner Johnson/Evinrude Bombardier Honda Yamaha Suzuki Force/US Marine Nissan Tohatsu Harbormaster Marine Outboard Drives Sears Gamefisher and Seagull
Sterndrives:
Mercruiser-Bravo OMC/Bombardier Volvo-Penta Yanmar Konrad Marine Drive Systems |
V-Drives:
Casale & Menkens
Bow & Tunnel Thrusters:
Harbormaster Marine
Marine Transmissions:
ZF Marine Transmission |
Marine gear oils operate in environments subject to water contamination. The chart below demonstrates the ability of AMSOIL Universal Synthetic Marine Gear Lube to maintain designed qualities such as extreme pressure/anti-wear performance and resistance to foaming, even when subjected to 10% water contamination.
The Falex Procedure is measurement of a gear lube's extreme pressure and anti-wear properties. A high value in the Falex Extreme Pressure Test relates to extra extreme pressure protection. AMSOIL Universal Synthetic Marine Gear Lube is not affected by water and provides 50% more extreme pressure protection for long gear and bearing life.
The presence of foam in a lubricant disrupts oil film and promotes wear. Water contamination can increase the likelihood of foaming. Industry standard testing demonstrates zero foam in both new and water-contaminated AMSOIL Universal Synthetic Marine Gear Lube. Other conventional gear lubes can foam when mixed with water, as seen in the graph.
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Extreme Pressure and Foam Stability Testing |
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Test |
AMSOIL Universal Synthetic Marine Gear Lube (AGM) |
Conventional Gear Lube (A) |
Conventional Gear Lube (B) |
FALEX Extreme Pressure Load Test B (LbF) (ASTM D-3233B) |
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no water |
with 10% water |
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1500 |
1500 | |
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no water |
with 10% water |
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1100 |
1000 | |
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no water |
with 10% water |
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1000 |
1000 | |
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Foam Stability (ASTM D-892) Sequence I Sequence II Sequence III |
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no water |
with 10% water |
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0/0 0/0 0/0 |
0/0 0/0 0/0 | |
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no water |
with 10% water |
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0/0 0/0 0/0 |
0/0 0/0 0/0 | |
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no water |
with 10% water |
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0/0 0/0 0/0 |
375/290 590/0 380/305 | |
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TYPICAL TECHNICAL PROPERTIES AMSOIL Universal Synthetic Marine Gear Lube75W/80W-90 (AGM) |
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Kinematic Viscosity @ 100°C, cSt (ASTM D-445) |
14.7 |
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Kinematic Viscosity @ 40°C, cSt (ASTM D-445) |
116.0 |
| Viscosity Index (ASTM D-2270) |
130 |
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Flash Point °C (°F) (ASTM D-92) |
216 (420.8) |
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Pour Point °C (°F) (ASTM D-97) |
-43 (-45) |
| Falex Procedure B (ASTM D-3233) (failure load, LbF.) |
1500 |
| Foam Stability (ASTM D-892) (20/50/20 maximum) |
0/0/0 |
AMSOIL Universal Synthetic Marine gear Lube is compatible with other commercially available conventional and synthetic marine gear lubes.
Follow manufacturers recommended service intervals.
It is generally a good idea to change gear lube at the end of the season prior to storage.
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