0W-40 Formula 4-Stroke Power Sports Synthetic Motor Oil

Our best selling ATV oil. May be the leading ATV oil in the Sioux Falls area. Historically the go to oil for smoother ATV engines under stress, heat and load. For all climates. Suggested for extreme heat and severe cold and everything in between. This is still our primary recommendation for all brands (ATV and Snowmobiles) over our specific viscosities. If you love your ATV and love riding you will be impressed. Yes an oil can make that much difference. Remember the 0W part is the winter test rating. Not a Zero weight!! It a reference to a scale for cold cranking loss but once the engine reached operating temperature, it is a SAE 40 just as any 10W-40. Think of it as being more fluid or closer to the proper viscosity before reaching operating temperature.  The “W” is representative to a flow-ability scale.  This oil was designed as the ultimate performer!!

Formulated for Top ATV and Snowmobile Performance

Formula 4-Stroke Power Sports Synthetic Motor OilAMSOIL Formula 4-Stroke Power Sports Synthetic Motor Oil is specially formulated for ATVs, UTVs, snowmobiles and other powersports applications. Its broad viscosity range and wax-free formulation make it excellent for use in both hot and cold temperature extremes. As an SAE 40-weight motor oil, AMSOIL Formula 4-Stroke Power Sports Oil provides outstanding protection for hot-operating engines, while its 0W rating and -60°F pour point ensure easy cranking, excellent cold-weather starting and quick post-startup protection. Formula 4-Stroke Power Sports Oil is an extreme-temperature lubricant that provides outstanding performance in high-performance, recreational or work/utility engines.

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Resists Heat and Thermal Breakdown

AMSOIL engineered Formula 4-Stroke Power Sports Synthetic Motor Oil to withstand the high temperatures of recreational engines. It effectively resists oxidation and oil vaporization to help prevent carbon/varnish formation, control oil consumption and minimize exhaust emissions. It also controls oil thickening, promoting improved fuel economy, and it helps keep engines clean for peak operating efficiency.

Excellent For Transmissions

AMSOIL Formula 4-Stroke Power Sports Oil is wet-clutch compatible and contains no friction modifiers, making it ideal for both two- and four-stroke ATV transmissions. The friction-modifier-free formulation is designed to prevent clutch slippage, helping deliver maximum torque and power to the wheels – a critical feature for towing or high-horsepower engines. It meets the frictional requirements of JASO MA/MA2 and ISO-L-EMA2.

Superior Wear Protection

AMSOIL Formula 4-Stroke Power Sports Oil is formulated with high levels of anti-wear additives that provide excellent protection for pistons, bearings and gears in transmission-containing units. Its shear-stable, SAE 40 viscosity delivers a thick lubricating film for an extra margin of protection in hard-working engines.

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Churning occurs in high-rpm engines that can cause oil to foam, depleting its lubricating abilities and increasing heat and wear. AMSOIL Formula 4-Stroke Power Sports Oil controls foam, promoting cooler engine operation and reduced wear.

Synthetic Warehouse Note:
0W-40 is for all climates! All Extremes!

In our Sioux Falls location this has become one of the top 10 best selling products. Although we have two other ATV motor oils that are more recent additions, this one is really all you need to know about. Best performance in all temperature categories. When we had our business in Texas (Hot summers) customers were amazed by the 0W-40 as to how well it performed in the heat. Yamaha owners especially commented on how well the product quieted the noisy motors once they got up to temperature.  Now up here in South Dakota it’s a major hit – so there in Sioux Falls it’s perfect for all your riding. The main benefit is it’s ability to keep deposits down by almost 80%. Ads life and resale value. AMSOIL makes it easy to keep your investment in top shape!

Special Additives

AMSOIL Formula 4-Stroke 0W-40 Power Sports Synthetic Motor Oil contains robust dispersant/detergent additives that effectively neutralize the high levels of acids and combustion by-products prone to small engines. It is anti-rust fortified for superior rust prevention, which is especially important in seasonally or infrequently used powersports equipment.


AMSOIL Formula 4-Stroke 0W-40 Power Sports Synthetic Motor Oil is recommended for four-stroke engines. It is also recommended for transmissions in two- or four-stroke applications. It is an all-climate/all-season oil that replaces 0W-30, 0W-40, 5W-30, 10W-30 and 10W-40 oils for ATVs, UTVs, snowmobiles and other powersports equipment. Also recommended as a replacement for Polaris Synthetic PS-4 Plus and Arctic Cat Synthetic ACX. Manufacturers include Polaris®, Honda®, Yamaha®, Ski-Doo®, Can-Am® (Bombardier®), Suzuki®, Kawasaki® and Arctic Cat®.

  • ISO-L-EMA2


AMSOIL Formula 4-Stroke Power Sports Synthetic Motor Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil’s life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL motor oils.


Follow the equipment manufacturer’s recommended drain intervals.


AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information.

Buy in the Sioux Falls AMSOIL store at 4610 W. 12th St. or use this Online link to the Amsoil sale page if you are outside of the area.