AMSOIL 0W-50 100% SYNTHETIC ATV/UTV MOTOR OIL

AMSOIL 0W-50 100% Synthetic ATV/UTV Motor Oil is a purpose-built replacement for Polaris PS-4 Extreme Full Synthetic 0W-50 Engine Oil, engineered to protect high-revving, shrouded engines in Polaris Ranger, RZR, Sportsman and General machines through punishing heat, heavy loads and brutal terrain.

ATVs and UTVs live a hard life. Shrouded engine compartments trap heat. Accessories like roofs, doors, skid plates, winches and plows add weight that pushes drivetrain temps even higher. Aggressive trail riding and heavy work duty compound the problem, breaking down oils designed for standard service and leaving critical engine components exposed to accelerated wear. A 0W-50 synthetic motor oil built specifically for this environment is not optional, it is the baseline for reliable operation.

RESERVE HEAT PROTECTION FOR SHROUDED ENGINES
Enclosed ATV and UTV engine bays do not get the airflow that exposed motorcycle or automotive engines enjoy. That trapped heat degrades conventional and lower-tier synthetic oils faster, reducing their ability to maintain a protective film on bearings, cylinders and valve train components. AMSOIL 0W-50 Synthetic ATV/UTV Motor Oil delivers an HT/HS viscosity of 5.0 cP at 150°C (ASTM D5481), maintaining a thick, durable oil film under extreme thermal stress. Its viscosity index of 191 (ASTM D2270) is exceptionally high, meaning the oil resists thinning as temperatures climb without being excessively thick when cold.

YEAR-ROUND PERFORMANCE FROM SUBZERO COLD TO PEAK SUMMER HEAT
Some Polaris owners switch between a lighter winter oil and a 10W-50 for summer. This 0W-50 eliminates that hassle. With a pour point of -48°C (-54°F) per ASTM D97, it flows immediately during cold-weather startups, reducing the dry-start wear that shortens engine life. At the other end of the spectrum, a kinematic viscosity of 19.4 cSt at 100°C (ASTM D445) keeps the oil thick enough to protect under sustained high-temperature, high-load operation. One oil, all seasons, no compromises.

RELIABLE WEAR PROTECTION UNDER HEAVY LOADS
Hauling feed, plowing snow, dragging logs or hammering whoops on a trail ride all punish engine internals. AMSOIL 0W-50 Synthetic ATV/UTV Motor Oil posted a Four-Ball Wear scar diameter of 0.53 mm in ASTM D4172 testing (150°C, 1800 rpm, 40 kg, 1 hour), demonstrating strong anti-wear performance in high-contact-pressure conditions. Advanced synthetic base oils resist oxidation and thermal breakdown, helping prevent the sludge and varnish buildup that chokes oil passages and accelerates component failure.

WET-CLUTCH COMPATIBLE WITH CONFIDENT ENGAGEMENT
Many ATVs and UTVs, including Polaris models, share engine oil with the clutch system. AMSOIL 0W-50 Synthetic ATV/UTV Motor Oil contains no friction modifiers that can cause clutch slippage. It meets the JASO MA specification, promoting smooth shifting, positive clutch engagement and consistent clutch feel whether you are crawling over rocks or accelerating hard out of a corner. It also helps control clutch-area heat, which extends clutch life over time.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL 0W-50 Synthetic ATV/UTV Motor Oil meets API SL and JASO MA specifications. It is specifically recommended for Polaris Ranger, RZR, Sportsman and General ATVs and UTVs that require a 0W-50 motor oil, and serves as a direct replacement for Polaris PS-4 Extreme Full Synthetic 0W-50 Engine Oil. It is compatible with other synthetic and conventional motor oils, though mixing will reduce the performance benefits and service life of the AMSOIL product. Aftermarket oil additives are not recommended. The product is Warranty Secure and will not void your factory warranty.

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