AMSOIL Synthetic 4-Stroke Motor Oils

by AMSOIL Synthetic Motor Oil Dealer

AMSOIL offers numerous different options when it comes to 2-cycle oils for your powersports and small engine equipment. Below you will find much information specific to each product, but, if that doesn’t help you completely narrow down your options, you can always check the AMSOIL Powersports Product Application Guide.

In addition, if you’re REALLY stuck and just don’t know which product to choose, please don’t hesitate to contact me and request assistance. I’m happy to help in any way that I possibly can. CLICK HERE for personalized assistance.

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AMSOIL Synthetic Motor Oil Bottle - 0w40Small 4-stroke engines run hot and place significant stress on the oil that lubricates them. You NEED an oil that can stand up to that heat and stress and NOT back down. AMSOIL synthetic 4-stroke oils are designed from the ground up to handle this kind of stress.

Click any of the tabs above to see our complete offering of 4-stroke synthetic motor oils for small engine and powersports applications. With such a wide selection, you’re bound to find an oil that’s perfect for our situation.

 

0w40


AMSOIL 100% Synthetic 0W-40 Motor Oil (AFF)

AMSOIL Synthetic Motor Oil Bottle - 0w40AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil (AFF) is specially formulated for ATVs, UTVs, snowmobiles and other power sports applications. Its broad viscosity range and wax-free formulation make it excellent for use in both hot and cold temperature extremes. As an SAE 40 weight motor oil, AMSOIL AFF provides outstanding protection for hot operating engines, while its 0W rating and -60°F pour point ensure easy cranking, excellent cold weather starting and quick post-startup protection.

Formula 4-Stroke® Power Sports is an extreme temperature lubricant that provides outstanding performance in high performance, recreational or work/utility engines.

AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL “The First in Synthetics” to do the best job protecting your engine.

Buy AMSOIL 100% Synthetic 0W-40 Motor Oil Now


Resists Heat and Thermal Breakdown

AMSOIL engineered Formula 4-Stroke® PowerSports Synthetic Motor Oil to withstand the high temperatures of recreational engines. It effectively resists oxidation and oil vaporization to prevent carbon/varnish formation, control oil consumption and minimize exhaust emissions. AMSOIL AFF controls oil thickening for good fuel economy, and it keeps engines clean for peak operating efficiency.

Excellent For Transmissions

AMSOIL Formula 4-Stroke® PowerSports Oil is wet clutch compatible and contains no friction modifiers, making it ideal for both two- and four-stroke ATV transmissions. The friction modifier-free formulation is designed to prevent clutch slippage, delivering maximum torque and power to the wheels – a critical feature for towing or high-horsepower engines. AMSOIL AFF meets the frictional requirements of JASO MA/MA2.

Superior Wear Protection

AMSOIL AFF is formulated with high levels of anti-wear additives that provide excellent protection for pistons, bearings and gears in transmission containing units, while its shear stable, SAE 40 viscosity delivers a thick lubricating film for an extra margin of protection in hard working engines.

Anti-Foam

Churning occurs in high RPM engines that can cause oil to foam, depleting its lubricating abilities and increasing heat and wear. AMSOIL AFF controls foam, promoting cooler engine operation and reduced wear.

Special Additives

AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil contains robust dispersant/detergent additives that effectively neutralize the high levels of acids and combustion by-products prone to small engines. And it is anti-rust fortified for superior rust prevention, which is especially important in seasonally or infrequently used power sports equipment.


AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil is recommended for four-stroke engines and transmissions on two- or four-stroke powered applications. It is an all climate/all season oil that replaces 0W-30, 0W-40, 5W-30, 10W-30 and 10W-40 oils for ATVs, UTVs, snowmobiles and other power sports equipment. Manufacturers include Polaris®, Honda®, Yamaha®, Ski-Doo®, Can-Am® (Bombardier®), Suzuki®, Kawasaki® and Arctic Cat®.

• API SL/CF, SJ, SH, SG
• JASO MA/MA2
• ISO-L-EMA2


AMSOIL AFF is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil life expectancy and reduce the performance benefits of AMSOIL. AMSOIL does not support extended drain intervals where oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL motor oils.


Follow the equipment manufacturer’s recommended drain intervals.


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). An MSDS is available upon request at 715-392-7101 or on the AMSOIL Website. Keep out of the reach of children. Don’t pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES

AMSOIL Formula 4-Stroke® PowerSports 0w40 Synthetic Motor Oil

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)

14.7

Kinematic Viscosity @ 40°C, cSt (ASTM D-445)

83.7

Viscosity Index (ASTM D-2270)

184

CCS Viscosity, cP @ (-35°C) (ASTM D-5293)

6139

Flash Point °C (°F) (ASTM D-92)

226 (439)
Pour Point °C (°F) (ASTM D-97)
-51 (-60)

Noack Volatility, % weight loss (g/100g) (ASTM D-5800)

7.3%

Four Ball Wear Test

(ASTM D-4172B: 40 kg, 75°C, 1200 rpm, 1 hour), Scar, mm

0.35
Total Base Number
10.5

 

10w30 Marine


AMSOIL 10w30 Formula 4-Stroke® Synthetic Marine Oil

AMSOIL 10w30 Formula 4-Stroke® Marine Synthetic Motor OilAMSOIL 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

National Marine Manufacturers Association (NMMA) CertifiedFormula 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

Buy AMSOIL 10w30 Formula 4-Stroke® Synthetic Marine Oil Now


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.

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.


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


AMSOIL 10w30 Marine is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will 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.

• 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.


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). An MSDS is available upon request at 715-392-7101 or on the AMSOIL Website. Keep out of the reach of children. Don’t pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES

AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCT)
SAE 10W-30, API SL, NMMA FC-W

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)

11.7

Kinematic Viscosity @ 40°C, cSt (ASTM D-445)

74.5

Viscosity Index (ASTM D-2270)

152

CCS Viscosity, cP @ (°C) (ASTM D-5293)

6032 (-25)

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)

Noack Volatility, % weight loss (g/100g) (ASTM D-5800)

4.8%

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

 

10w40 Marine


AMSOIL 10w40 Formula 4-Stroke® Synthetic Marine Oil

AMSOIL 10w40 Formula 4-Stroke® Marine Synthetic Motor OilAMSOIL 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

National Marine Manufacturers Association (NMMA) CertifiedFormula 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

Buy AMSOIL 10w40 Formula 4-Stroke® Synthetic Marine Oil Now


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.

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.


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


AMSOIL 10w40 Marine is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will 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.

• 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.


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). An MSDS is available upon request at 715-392-7101 or on the AMSOIL Website. Keep out of the reach of children. Don’t pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES

AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCF)
SAE 10W-40, API SL, NMMA FC-W

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)

14.1

Kinematic Viscosity @ 40°C, cSt (ASTM D-445)

93.8

Viscosity Index (ASTM D-2270)

154

CCS Viscosity, cP @ (°C) (ASTM D-5293)

6871 (-25)

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)

Noack Volatility, % weight loss (g/100g) (ASTM D-5800)

6.40%

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

 

10w40 Scooter


AMSOIL Synthetic Formula 4-Stroke 10W-40 Scooter Oil

AMSOIL Synthetic Formula 4-Stroke 10W-40 Scooter OilAMSOIL Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO) is formulated specifically to meet the special needs of today’s high-tech air- and water-cooled fourstroke motorized scooters, offering unsurpassed wear protection and friction reduction for longer equipment life and cooler operating temperatures.

Its exceptional shear stability ensures consistent viscosity protection and provides additional protection for transmissions and gear boxes, while its friction modifier-free formulation ensures wet clutch compatibility and smooth clutch operation. A special anti-corrosion additive package provides long-term protection during periods of inactivity and storage.

Buy AMSOIL Synthetic Formula 4-Stroke 10W-40 Scooter Oil Now


Shear Stability

High engine rpms common to scooter applications increase shear, causing conventional lubricants to lose viscosity and reduce their ability to control wear, resulting in shorter engine life. The synthetic formulation of Formula 4-Stroke Synthetic Scooter Oil effectively resists shear, delivering consistent viscosity protection for unsurpassed wear protection and extended equipment life.

Thermal Stability

The operating temperatures of scooter engines fluctuate greatly, especially with air-cooled engines. Formula 4-Stroke Synthetic Scooter Oil resists breakdown at elevated temperatures, maintaining its protective viscosity for maximum wear control.

Transmission and Gear Box Compatibility
In many scooter applications, the engine and transmission and/or gear box share the same oil reservoir. Formula 4-Stroke Synthetic Scooter Oil is absolutely shear stable and will not thin out from mechanical activity, providing superior protection for transmissions and gear boxes.

Wet Clutch Compatibility

Some scooters utilize a frictional clutch to engage and disengage the engine from the drivetrain. In many cases, this clutch is immersed in the same oil used in the engine and transmission. Formula 4-Stroke Synthetic Scooter Oil contains no friction modifiers and is wet clutch compatible, offering smooth clutch operation and increased clutch life.

Rust and Corrosion Protection

Scooters are often subjected to extended periods of inactivity and storage, exposing the equipment to internal rust and corrosion. Formula 4-Stroke Synthetic Scooter Oil is formulated with a special anti-corrosion additive package designed to provide long-term protection during periods of inactivity and storage.


AMSOIL Formula 4-Stroke Synthetic Scooter Oil is recommended for use wherever SAE 10W-40 motor oil is specified in air- and watercooled four-stroke motorized scooter engines, transmissions and gear boxes that require the following:

  • API SG, SL/CF
  • JASO MA/MA2 (motorcycle wet clutch)
  • ISO-L-EMA2

Engine manufacturers include, but are not limited to, Honda, Kawasaki, Suzuki, Yamaha, Vespa, Aprilia, Piaggio, Benelli, Vento, Kymco, Tank and TGB.


AMSOIL 10w30 Small Engine Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will 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.


Follow the equipment manufacturer’s recommended drain intervals.


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). An MSDS is available upon request at 715-392-7101 or on the AMSOIL Website. Keep out of the reach of children. Don’t pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES
 Formula 4-Stroke® 10W-40 Synthetic Scooter Oil (ASO)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)

14.7

Kinematic Viscosity @ 40°C, cSt (ASTM D-445)

94.3

Viscosity Index (ASTM D-2270)

162

Pour Point °C (°F) (ASTM D-97)

-38 (-36)

Flash Point °C (°F) (ASTM D-92)

232 (450)

Fire Point °C (°F) (ASTM D-92)

250 (482)

Four Ball Wear Test
(ASTM D-4172B: 40 kgf, 75°C, 1200 rpm, 1 hr), Scar, mm

0.40

Noack Volatility, % weight loss (g/100g) (ASTM D-5800)

5.4

High Temperature/High Shear Viscosity
(ASTM D 4683 @ 150°C, 1.0 X 106 s.-1), cP

4.1

Total Base Number

7.4


 
 

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