AMSOIL 5W-50 100% SYNTHETIC ATV/UTV MOTOR OIL

AMSOIL 5W-50 100% Synthetic ATV/UTV Motor Oil is a purpose-built engine oil designed to protect high-revving, hard-working ATV and UTV engines from the punishing heat and mechanical stress that come with aggressive trail riding, heavy hauling, and severe-duty operation. It is a direct, high-performance replacement for Polaris PS-4 Full Synthetic 5W-50 Engine Oil.

ATVs and UTVs operate under conditions most passenger car engines never see. Shrouded engine compartments trap heat. Accessories like roofs, doors, skid plates, winches, and plows add weight that increases engine loading. Aggressive riding through mud, sand, and steep terrain pushes RPMs high for sustained periods. All of this accelerates oil breakdown in products formulated for standard service, leaving your engine vulnerable right when it needs protection most.

RESERVE PROTECTION AGAINST EXTREME HEAT
Shrouded engine designs and heavy accessory loads generate significant heat that conventional and many OEM-branded oils simply are not built to handle. AMSOIL 5W-50 Synthetic ATV/UTV Motor Oil resists oxidation and thermal breakdown under sustained high temperatures. With a flash point of 240°C (464°F) and a fire point of 266°C (511°F) per ASTM D92 testing, this oil holds together when engine bay temperatures climb. Its Noack volatility of just 4.7% weight loss (ASTM D5800) means less oil is burned off during operation, so you maintain oil volume and protection over the full service interval.

RELIABLE WEAR PROTECTION FOR HIGH-RPM ENGINES
Small-displacement ATV and UTV engines routinely operate at higher RPMs and under heavier relative loads than most automotive engines. That combination accelerates component wear if the oil film breaks down. AMSOIL 5W-50 delivers an HT/HS viscosity of 5.3 cP at 150°C (ASTM D5481), maintaining a thick, durable lubricating film even at elevated operating temperatures. The Four-Ball Wear Test (ASTM D4172) returned a scar diameter of 0.52 mm, confirming strong anti-wear performance under loaded, high-temperature conditions.

SUPERIOR ALL-WEATHER PERFORMANCE
Cold starts in early-morning hunts or late-season trail rides put engines at risk. Oil that is too thick at startup cannot reach critical components fast enough. AMSOIL 5W-50 Synthetic ATV/UTV Motor Oil has a pour point of -48°C (-54°F) per ASTM D97, remaining fluid in sub-zero temperatures for fast oil circulation and reduced dry-start wear. At the same time, a viscosity index of 179 (ASTM D2270) means the oil resists thinning as temperatures climb. This wide operating range makes it an ideal year-round oil for Polaris Ranger, RZR, Sportsman, and General models that would otherwise require switching to a 10W-50 in summer, saving you both time and maintenance costs.

WET-CLUTCH COMPATIBLE
Many ATVs and UTVs use a shared sump where the engine oil also lubricates the clutch. AMSOIL 5W-50 Synthetic ATV/UTV Motor Oil contains no friction modifiers that cause clutch slippage in wet-clutch systems. It meets JASO MA requirements, promoting smooth shifting and positive clutch engagement while controlling heat to help extend clutch life.

PREMIUM REPLACEMENT FOR POLARIS PS-4 5W-50
AMSOIL specifically formulated this oil for use in Polaris Ranger, RZR, Sportsman, and General ATVs and UTVs. It is recommended as a direct replacement for Polaris PS-4 Full Synthetic 5W-50 Engine Oil, delivering high-performance synthetic protection without the premium OEM price tag. This product is Warranty Secure and will not void your factory warranty.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL 5W-50 Synthetic ATV/UTV Motor Oil meets API SL and JASO MA specifications. It is compatible with other synthetic and conventional motor oils, though mixing will shorten the life expectancy and reduce the performance benefits of the AMSOIL product. Aftermarket oil additives are not recommended.

SERVICE LIFE
Follow the original equipment manufacturer's recommended oil-change interval.