Developed by AMSOIL for hard-working and performance ATVs and UTVs. Advanced synthetic technology resists oxidation and protects against extreme heat to help prevent sludge and varnish. Cools shrouded engines. Wet-clutch compatible. Stay-in-grade formulation maintains protection in ATVs and UTVs used for hauling, plowing, or conquering tough terrain.
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Product data sheets
View, download, or save a copy of the Product Data Sheet or Safety Data Sheet for AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil.
AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil is a purpose-built four-stroke lubricant for ATVs and UTVs that specify an SAE 10W-40 viscosity grade. The formulation meets API SL and JASO MA, supports shared-sump engines with wet-clutch hardware, and targets the heat and load profile produced by hauling, plowing, trail riding, and aggressive use on tough terrain. Owners of 10W-40-spec quads and side-by-sides from Can-Am, CFMOTO, Honda, John Deere, Kawasaki, Kubota, Suzuki, and Yamaha are the intended buyers.
Severe-service engine protection
Off-road four-stroke engines run hot, run hard, and live behind plastic body panels that trap heat in the cylinder head and oil sump. Aftermarket cargo boxes, winches, plows, doors, roofs, and skid plates add weight and increase load on the crankshaft, cams, and rod bearings. AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil is built around a synthetic base stock and a severe-service additive system that delivers reserve protection against heat for engines pulling against that kind of load.
Wear control is anchored by a 0.57 result in the ASTM D4172 Four-Ball Wear Test at 150 C, 1800 rpm, 40 kg, one hour. The formula builds a strong fluid film between metal surfaces, provides reliable wear protection, and aids in cooling shrouded engines that dump heat into the oil rather than the airstream.
All-weather viscosity stability
A 10W-40 ATV oil has to start cleanly on a frozen morning, stay in grade through a hot afternoon, and resist mechanical shear from a wet clutch and a transmission running through the same sump. The formula carries a viscosity index of 165 in ASTM D2270, a pour point of -40 C in ASTM D97, and a kinematic viscosity of 14.1 cSt at 100 C in ASTM D445. The high-temperature, high-shear viscosity in ASTM D5481 at 150 C is 4.1 cP, well above the 2.9 cP minimum required by SAE J300 for an SAE 40 grade. The oil remains fluid in subzero temperatures for excellent startup protection and resists thinning from extreme heat and mechanical shear in hot conditions.
Wet-clutch compatibility and consistent shift feel
ATV and UTV engines often share a single sump between the crankcase, the transmission, and the wet clutch. A motor oil loaded with passenger-car friction modifiers can cause the clutch plates to slip, glaze, or chatter during launch. AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil contains no friction modifiers and meets the JASO MA wet-clutch standard, the same friction class specified for the bulk of 10W-40 quad and side-by-side platforms. Superior friction-durability properties help minimize clutch slippage, fade, and chatter, which gives riders a consistent clutch grab during takeoffs and predictable engagement when feathering through technical sections.
Oxidation control and clean engine internals
Heat and oxygen drive sludge, varnish, and ring-zone deposits in shrouded four-stroke engines. The formula resists oxidation through long idle periods, hard throttle transitions, and the stop-and-go cadence typical of farm, hunting, and recreational use. NOACK volatility in ASTM D5800 is 4.7 percent weight loss, which limits oil burn-off in the combustion chamber and helps hold viscosity through the service interval. The flash point in ASTM D92 is 242 C (468 F) and the fire point is 268 C (514 F), both indicators of the lubricant's resistance to vaporization in a hot, shrouded sump.
Premium, purpose-built alternative to OEM-branded fluids
This oil is engineered as a high-performance, cost-effective alternative to original equipment manufacturer-branded ATV and UTV fluids. Coverage spans Can-Am, CFMOTO, Honda, John Deere, Kawasaki, Kubota, Suzuki, and Yamaha machines that call for an SAE 10W-40 motor oil meeting API SL and JASO MA. Polaris Ranger, RZR, Sportsman, and General platforms typically specify 0W-50 or 5W-50, and those owners should match the AMSOIL viscosity grade listed for that vehicle in the ATV/UTV product line.
Recommended applications and service intervals
AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil is intended for four-stroke ATV and UTV engines that specifically call for an SAE 10W-40 motor oil meeting API SL and JASO MA. Common application territory includes trail-class quads, chore-class side-by-sides, and shared-sump four-stroke engines used for hauling, plowing, and aggressive recreational riding.
Service interval: follow the original equipment manufacturer's oil-change recommendation for the specific machine and duty cycle.
Severe service such as plowing, hauling, towing, racing, dusty trails, deep mud, and extended low-speed operation increases load and heat, so the OEM severe-service interval applies.
Polaris Ranger, RZR, Sportsman, and General models that specify 0W-50 or 5W-50 should use the matching AMSOIL ATV/UTV grade rather than this 10W-40.
Outside the United States and Canada, follow the vehicle manufacturer's recommended drain interval and the viscosity grade printed in the owner manual.
This oil is compatible with other conventional and synthetic motor oils, but mixing shortens the life expectancy of the formula and reduces performance benefits. Extended drain coverage is not supported when oils have been mixed. Aftermarket oil additives are not recommended. Pair every oil change with a fresh OEM-spec filter to support full-flow filtration for the shared-sump design.
Typical technical properties
Property
Value
Kinematic Viscosity at 100 C, cSt (ASTM D445)
14.1
Kinematic Viscosity at 40 C, cSt (ASTM D445)
88.3
Viscosity Index (ASTM D2270)
165
Flash Point, C (F) (ASTM D92)
242 (468)
Fire Point, C (F) (ASTM D92)
268 (514)
Pour Point, C (F) (ASTM D97)
-40 (-40)
NOACK Volatility, percent weight loss (ASTM D5800)
High-Temperature High-Shear Viscosity at 150 C, cP (ASTM D5481)
4.1
Order AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil
The 10W-40 ATV/UTV grade is available as a quart bottle (product code AUV40QT-EA) and a case of 12 quarts (AUV40QT-CA). The product is Warranty Secure, which means installation does not void a new vehicle or equipment manufacturer warranty, and the formula is backed by the AMSOIL Limited Warranty. Confirm the right grade for the specific quad or side-by-side in the AMSOIL Vehicle Lookup Guide, review wet-clutch and shared-sump fundamentals in the ATV Oil Guide, then order AMSOIL 10W-40 100% Synthetic ATV/UTV Motor Oil.
What ATVs and UTVs take AMSOIL 10W-40 ATV/UTV Motor Oil?
The 10W-40 grade is intended for four-stroke ATVs and UTVs that specify an SAE 10W-40 motor oil meeting API SL and JASO MA. Coverage includes machines made by Can-Am, CFMOTO, Honda, John Deere, Kawasaki, Kubota, Suzuki, and Yamaha that call for that grade. The owner manual viscosity table is the final authority on whether the engine is built for 10W-40.
Is AMSOIL 10W-40 ATV/UTV Motor Oil wet-clutch compatible?
Yes. The formula contains no friction modifiers and meets JASO MA, which is the friction class typical for shared-sump four-stroke ATV and UTV engines that combine the engine, transmission, and wet clutch in a single oil supply. Wet-clutch compatibility supports consistent clutch grab and helps minimize slippage, fade, and chatter during takeoff.
Can this 10W-40 be used in a Polaris Sportsman or Ranger?
Polaris Ranger, RZR, Sportsman, and General platforms typically specify a 0W-50 or 5W-50 motor oil rather than a 10W-40. For Polaris machines that call for those grades, the matching 0W-50 or 5W-50 AMSOIL Synthetic ATV/UTV Motor Oil is the correct fluid. Confirm the required viscosity for the specific year and trim in the AMSOIL Vehicle Lookup Guide.
What viscosity is 10W-40 at operating temperature?
The 10W rating describes cold-start flow, while the 40 rating describes high-temperature viscosity defined by SAE J300. The kinematic viscosity at 100 C is 14.1 cSt in ASTM D445, the high-temperature, high-shear viscosity at 150 C is 4.1 cP in ASTM D5481, and the viscosity index is 165 in ASTM D2270. The grade stays in spec across hot operating cycles and resists shear from gear-mesh and clutch contact in shared-sump designs.
How long should this oil stay in the engine?
Service interval guidance follows the original equipment manufacturer recommendation for the specific machine and the way the machine is used. Plowing, racing, dusty trail use, deep mud, hauling, and extended low-speed operation count as severe service, and the OEM severe-service interval applies. Pair every oil change with an OEM-spec filter.
Will using AMSOIL ATV/UTV Motor Oil void a factory warranty?
No. Installing AMSOIL synthetic lubricants does not void a new vehicle or equipment manufacturer warranty, and the product is Warranty Secure and backed by the AMSOIL Limited Warranty.
