AMSOIL 10W-40 100% SYNTHETIC ATV/UTV MOTOR OIL

AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil is a severe-service formula built to protect hard-working and high-performance ATVs and UTVs from the heat, stress, and mechanical punishment that come with real-world riding and work duty. It replaces OEM-branded 10W-40 oils in machines from Can-Am, CFMOTO, Honda, John Deere, Kawasaki, Kubota, Suzuki, and Yamaha with a purpose-built synthetic that holds up where standard oils fall short.

ATVs and UTVs operate under conditions most engines never see. Shrouded engine compartments trap heat, aggressive trail riding pushes RPMs to the redline, and bolt-on accessories like plows, winches, skid plates, and cab enclosures add weight that increases the severity of every ride. Combine that with wet-clutch systems that share oil between the engine and transmission, and you have a demanding environment that breaks down conventional and basic synthetic oils faster than their service intervals suggest.

RESERVE PROTECTION AGAINST HEAT IN SHROUDED ENGINES
ATV and UTV engines sit under body panels and accessories that restrict airflow, driving operating temperatures well above what you'd see in a typical engine bay. That heat accelerates oil breakdown, promoting sludge and varnish formation that robs performance. AMSOIL 10W-40 Synthetic ATV/UTV Motor Oil uses advanced synthetic base stocks that resist oxidation and thermal breakdown. Its flash point of 242°C (468°F) and fire point of 268°C (514°F) reflect the thermal stability built into this formulation, helping it maintain protective film strength even under sustained high-temperature operation. A Noack volatility of just 4.7% weight loss (ASTM D5800) means less oil is burned off as vapor, so the oil stays in the engine doing its job instead of exiting the exhaust.

RELIABLE WEAR PROTECTION UNDER HEAVY LOADS
Hauling firewood, plowing snow, towing trailers, or hammering through rock gardens all place enormous stress on engine internals. The Four-Ball Wear Test (ASTM D4172, 150°C, 1800 rpm, 40 kg, 1 hour) returned a wear scar of 0.57 mm for this 10W-40 formulation, confirming its ability to maintain a durable lubricating film between metal surfaces under load. High-Temperature/High-Shear viscosity measured 4.1 cP at 150°C (ASTM D5481), which means the oil resists thinning at elevated temperatures and high shear rates, exactly the conditions present in heavily loaded ATV and UTV engines.

CONSISTENT CLUTCH FEEL WITH WET-CLUTCH COMPATIBILITY
Wet-clutch systems are sensitive to oil formulation. Friction modifiers found in many automotive oils cause clutch slippage, fade, and inconsistent engagement that makes low-speed maneuvering unpredictable. AMSOIL 10W-40 Synthetic ATV/UTV Motor Oil contains no friction modifiers and is formulated with superior friction-durability properties that help minimize clutch slippage, fade, and chatter. The result is positive clutch engagement and a consistent clutch feel during takeoffs, hill climbs, and tight trail maneuvering. It also controls heat buildup in the clutch pack, which helps extend clutch life over time.

ALL-WEATHER PERFORMANCE FROM SUBZERO COLD TO EXTREME HEAT
A pour point of -40°C (-40°F) means this oil remains fluid in frigid conditions, providing excellent cold-start protection when you fire up a Kawasaki Brute Force or Honda Pioneer on a winter morning. On the other end of the spectrum, a viscosity index of 165 (ASTM D2270) demonstrates strong resistance to viscosity change across a wide temperature range. The oil stays thick enough to protect at operating temperature while flowing freely at startup, reducing the dry-start wear that shortens engine life.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL 10W-40 Synthetic ATV/UTV Motor Oil meets API SL and JASO MA specifications. It is designed for use in ATVs and UTVs requiring a 10W-40 motor oil, including machines from Can-Am, CFMOTO, Honda, John Deere, Kawasaki, Kubota, Suzuki, and Yamaha. 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. This oil is Warranty Secure and will not void your vehicle's factory warranty.

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