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

Protect your ATV or UTV engine from heat, wear, and clutch slippage with advanced synthetic oil for all-weather, heavy-duty performance.

Product Code	Package Size	Unit of Measure
AUV40QT-EA	Quart Bottle	Each
AUV40QT-CA	Quart Bottle	Case of 12

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Product Details

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.

Property	Value	Test Method
Kinematic Viscosity @ 100°C, cSt	14.1	ASTM D445
Kinematic Viscosity @ 40°C, cSt	88.3	ASTM D445
Viscosity Index	165	ASTM D2270
Flash Point, °C (°F)	242 (468)	ASTM D92
Fire Point, °C (°F)	268 (514)	ASTM D92
Pour Point, °C (°F)	-40 (-40)	ASTM D97
Noack Volatility, % weight loss (g/100g)	4.7	ASTM D5800
Four-Ball Wear Test, mm (150°C, 1800 rpm, 40 kg, 1 hr)	0.57	ASTM D4172
HT/HS Viscosity @ 150°C, cP (1.0 x 10⁶ s⁻¹)	4.1	ASTM D5481

Frequently Asked Questions

AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil (AUV40QT) is developed specifically for hard-working and performance ATVs and UTVs. It is compatible with a wide range of machines including Polaris Ranger, Polaris General, Honda Pioneer, Kawasaki KRX, Yamaha YFZ 450R, and similar models. The product page also lists broader application categories including motorcycle, snowmobile, marine outboard, PWC, and agriculture equipment.

AMSOIL 10W-40 ATV/UTV Motor Oil uses advanced synthetic technology that delivers reserve protection against heat for heavily loaded engines. It resists oxidation and protects against extreme heat to help prevent sludge and varnish buildup. The stay-in-grade formulation maintains its protective properties even in ATVs and UTVs used for demanding tasks like hauling, plowing, or conquering tough terrain. It also aids in cooling shrouded engines, which are common in ATV and UTV designs.

A stay-in-grade formulation means AMSOIL 10W-40 ATV/UTV Motor Oil resists thinning due to extreme heat and mechanical shear, maintaining its 10W-40 viscosity throughout the service interval. This is critical in ATVs and UTVs because these engines operate under heavy loads and high temperatures that can break down lesser oils. By staying in grade, the oil continues to deliver superior protection and consistent performance rather than degrading into a thinner, less protective fluid.

AMSOIL 10W-40 ATV/UTV Motor Oil delivers superior all-weather performance compared to conventional alternatives. It remains fluid in subzero temperatures to provide excellent startup protection, while also resisting thinning due to extreme heat and mechanical shear for superior protection in hot conditions. This dual capability means the oil performs reliably whether you're plowing snow in winter or riding hard trails in summer heat, unlike conventional oils that may struggle at temperature extremes.

AMSOIL recommends consulting the product data sheet and your vehicle's owner's manual for specific oil change intervals. The advanced synthetic technology in AMSOIL 10W-40 ATV/UTV Motor Oil resists oxidation and helps prevent sludge and varnish, which supports consistent performance throughout the service interval. For ATVs and UTVs used in severe-service conditions such as heavy hauling, plowing, or extreme terrain, monitoring oil condition is especially important.

Yes, AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil is specifically formulated to be wet-clutch compatible. Its superior friction-durability properties help minimize clutch slippage, fade, and chatter, giving riders consistent clutch feel during takeoffs or when maneuvering around obstacles on the trail. Verified buyers have confirmed improved clutch engagement and better performance in wet-clutch machines like the Honda Pioneer, reporting that the clutch grabs better compared to other oils.