AMSOIL Formula 4-Stroke® Power Sports 0W-40 Synthetic Motor OilAMSOIL Formula 4-Stroke Power Sports 0W-40 Synthetic Motor Oil (AFF) offers serious year-round protection for 4-stroke ATVs, snowmobiles (including turbocharged engines), Side-by-Sides and utility engines. It is ideal for most any 4-stroke engine on your yard. This four-stroke oil is also excellent for wet clutches and transmissions. The powerful synthetic 0W-40 formula allows it excel in winter or summer. Can replace and outperform Polaris 2W-50 Synthetic PS-4 Plus and Arctic Cat 5W-50 Synthetic ACX 4-stroke oils (see below).


Formula 4-Stroke 0W-40 package sizes include:
1-Quart Bottle
1-Quart Bottles (case of 12)
30 or 50- US Gallon Drums

Article: Can AMSOIL 0W-40 Replace Polaris 2W-50 & Arctic Cat 5W-50?

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Applications for AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil

  • ATV engines and transmissions
  • Snowmobiles (including turbocharged 4-stroke engines)
  • UTVs
  • Side-by-Sides
  • Lawn and garden equipment
  • Most any powersport or utility 4-stroke engine

AMSOIL AFF 0W-40 can replace the following viscosities in Ski-Doo, Can-Am, Polaris, Arctic Cat, Yamaha, Honda, Suzuki, Kawasaki, John-Deere and other 4-stroke engines:

  • 0W-30
  • 0W-40
  • 5W-30
  • 10W-30
  • 10W-40
  • 2W-50
  • 5W-50

AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil is suitable for applications requiring the following specifications:

  • ISO-L-EMA2

Features and Benefits of AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil

  • Performs in extreme cold
  • Withstands hot operating temperatures
  • Lowers friction for improved performance and lower wear
  • Does not thin out after hard use and long service
  • Resists oil usage
  • Does not contain friction modifiers for excellent wet-clutch and transmission performance
  • Contains anti-rust additives for off-season storage protection
  • Can replace many 4-stroke oils over a wide viscosity range

Wear Defense for 4-Stroke Engines

The four-cycle engines of ATV’s and snowmobiles can often receive quite a thrashing. AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil uses a sophisticated synthetic base oil and powerful anti-wear additives to protect from extreme heat, heavy loads and extended periods of full throttle operation.

Performs in Cold Weather

With a cold-pour-point of -51C (-60F), AMSOIL Formula 4-Stroke 0W-40 cranks easily in any weather and brings instant oil flow for fast start-up protection.

Ideal Oil for Turbocharged Snowmobiles

AMSOIL Formula 4-Stroke withstands extreme heat and resists deposit formation making it is ideal for use in turbocharged engines found on many of today’s 4-stroke snowmobiles. Suitable for models such as Polaris Turbo IQ and Arctic Cat 4-Stroke Turbo.

A Worthy Transmission Performer

Many ATV’s have manual transmissions that require a 4-stroke oil that can withstand the shearing of gears and also be suitable for wet-clutches. AMSOIL AFF 0W-40 is designed withstand transmission service as well as improve shifting by lowering friction. It does not contain friction modifiers, so clutch plate glazing is not a risk.

Off-Season Rust Protection

When your toys are put away for the season, AMSOIL 0W-40 contains powerful anti-rust and corrosion inhibitors to keep your engine internals pristine and free of rust damage.

Lower Oil Consumption

The shear stability and low volatility of AMSOIL AFF 0W-40 means that your oil level will stay steady and not thin out or boil off in hot conditions or under heavy loads.

Shear Stable

AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil offers much stronger resistance to shearing versus Polaris Synthetic PS-4 Plus and Arctic Cat Synthetic ACX. Both are 50-weight oils when new, but ASTM-7109 Shear Stability Testing shows that they lose over 30% of their viscosity very quickly. AMSOIL AFF is a better alternative as it resists shearing by losing just 5%, offering superior long-term wear control.AMSOIL 0W-40, Polaris & Arctic Cat Shear Test

Mixing AMSOIL 4-Stroke Synthetic Oil with Other Brands

AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil is compatible with all other brands of conventional, semi-synthetic and synthetic 4-stroke engine oils. While you can safely mix AMSOIL Synthetic Oil with other brands, this will reduce the drain interval and performance capabilities of AMSOIL oil.

The use of any aftermarket oil additives is definitely NOT recommended.

Service Life for AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil

AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil is recommended for oil change intervals as stated by the vehicle owner’s manual.

Specifications of AMSOIL Formula 4-Stroke 0W-40 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 @ (°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
Total Base Number10.5
AMSOIL Formula 4-Stroke 0W-40 Synthetic Motor Oil
A synthetic oil upgrade for year-round protection of 4-stroke snowmobiles, ATV's and 4-cycle equipment.
Manufacturer: AMSOIL
Model: Formula 4-Stroke 0W-40 Synthetic Motor Oil
Product ID: AFF