AMSOIL Synthetic 5W-50 ATV/UTV Motor OilMove up to AMSOIL for your Polaris ATV or Side By Side (including turbo-charged models). This oil is bred for extreme off-road conditions and is a superior replacement for Pure Polaris PS-4, PS-4 Plus and PS-4 Extreme Duty four-stroke oils.

AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil package sizes include:

  • Single US Quart Bottle
  • Case of 12 US Quart Bottles

We can offer AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil at the lowest prices in Canada or the US. Request a wholesale price list using the contact form on your right.

About AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil

This full-synthetic maximizes performance and protects your engine from wear in all climates and under the toughest terrain and loads. This product is 100% wet-clutch compatible and warranty compliant.

Suitable Applications For AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil

This product is suitable for Polaris 4-cycle engines or engine/transmission combinations in ATVs, UTVs and Side By Sides. This product is ideal for all engines and model-years of the following Polaris 4-stroke models:

  • Ranger
  • Sportsman
  • RZR (including turbo models)
  • Scrambler
  • Big Boss
  • Trail Boss
  • Trail Blazer
  • Outlaw
  • Phoenix
  • Predator
  • Hawkeye
  • X2
  • Magnum
  • Sawtooth
  • MV7
  • ATP
  • Expedition

AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil is an elite substitute for the following Pure Polaris oils:

  • Polaris PS-4 Full-Synthetic 5W-50
  • Polaris PS-4 Plus
  • Polaris PS-4 Extreme Duty 10W-50
Polaris RZR XP 1000 EPS White Lightning

AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil is the perfect engine oil for this Polaris RZR XP 1000 EPS White Lightning. (photo credit:

Can AMSOIL 5W-50 Replace Polaris PS-4 Extreme Duty 10W-50?

No problem at all. Remember that both oils are in the 50 weight range at operating temperatures. The reason that Polaris opts for a 10W-50 in some of their models in hot temperatures is that they are concerned about their oil shearing down in extreme heat. Perhaps they should be. A few years ago, we published testing that compared AMSOIL Formula 4-Stroke 0W-40 versus Polaris PS-4 Plus. The AMSOIL 0W-40 proved to be dramatically superior to the 2W-50 PS-4 Plus when it came to viscosity endurance testing and shear resistance. With the latest technology that AMSOIL has employed in this 5W-50 ATV Oil, there is no doubt that will easily handle applications where Polaris PS-4 Extreme Duty 10W-50 is suggested.

Extreme Engine Wear Protection

AMSOIL attacks engine wear from every angle with this ATV 5W-50. The full-synthetic formula lowers friction which reduces wear and provides cooler operation. The heavy viscosity protects against metal-to-metal wear during heavy loads and long periods at full throttle. It is also ideal for turbo-charged ProStar engines. Lastly, AMSOIL uses a premium base oil that will not lose its viscosity protection, no matter what you throw at it.

Ideal for Summer or Winter Service

Here is an ATV oil that can handle the weather conditions of every single day of the year. In the face of extreme heat, heavy loads or steep grades, this oil lowers friction for cooler operating temperatures and will not lose viscosity between oil changes. On cold northern mornings, a cold-pour point of -43°C (-45°F) means your engine receives instant start-up protection.

Outstanding Anti-Rust and Corrosion Protection

Serious off-road machines can frequently be exposed to water and mud crossings. Some units can also be stored for several months of the year. For these reasons, they require engine oil that provides serious anti-rust protection. Not all ATV oils address this concern. AMSOIL borrows anti-rust additive technology from their 4-stroke marine oils to keep your Polaris engine internals in pristine condition.

Service Life of AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil

This AMSOIL 5W-50 ATV Oil should be changed at the interval as prescribed by your owner’s manual.


AMSOIL Synthetic 5W-50 ATV/UTV Motor Oil (AUV50)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)20.2
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)128.6
Viscosity Index (ASTM D-2270)180
Noack Volatility, % weight loss (g/100g) (ASTM D-5800)5.7
Pour Point °C (°F) (ASTM D-97)-43 (-45)
Flash Point °C (°F) (ASTM D-92)238 (460)
High Temperature/High Shear Viscosity @ 150°C , 1.0 x 106 s-1), cP (ASTM D5481)5.5