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Amsoil's Smooth Running ATV 4-Stroke Oil

A best seller to the ATV owner.

0W40 ATV Oil - AMSOIL Synthetic Formula 4-Stroke (ATVs, Sleds & UTV's) Product Code AFF.

The Performance Advantage - Protection Built In

Other ATV Related products and Polaris OEM equivalents listed at the bottom of this section. It's now one of our best selling products!

AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil (AFF) is specially formulated for four-stroke recreational motors, ATVs and snowmobiles. Reduces wear. Wet clutch compatible. Contains no friction modifiers. Broad viscosity range makes it excellent for use in both hot and cold weather conditions.

Package Size Includes
1-Quart Bottle
1-Quart Bottles (case of 12)
30-Gallon Drum
55-Gallon Drum

Call for wholesale pricing, account set-up or order at

Printable Product Data Sheet for AMSOIL Synthetic ATV Engine Formula 0W40.

Other ATV Related products and OEM equivalents listed at the bottom of the section.

Buy Amsoil 0W40 (AFF) In the Online Store Now


Vehicle Look Up Table: Matches AMSOIL's products to your vehicles.


Overview & Description
AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil (AFF) is specially formulated for ATVs, UTVs, snowmobiles and other power sports 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 AFF 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 is an extreme temperature lubricant that provides outstanding performance in high performance, recreational or work/utility engines.

Step up to AMSOIL & enjoy performance from a name you trust!

AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, The First in Synthetics®, to do the best job protecting your engine.

What does AMSOIL say about the OEM 50WT oils out there Polaris and Arctic Cat recommend?

AMSOIL Magazine: Moving on to ATV applications, why does AMSOIL recommend Formula 4-Stroke® Power Sports
Oil (0W-40) in applications that call for OEM-labeled 50-weight oils?

Len Groom: As the graph shows, while Polaris Synthetic PS-4 Plus and Arctic Cat Synthetic ACX motor oils fall within a 50-weight viscosity range directly from the bottle, both quickly shear down into the 40-weight range. AMSOIL subjected both oils along with Formula 4-Stroke Power Sports Oil to ASTM D-7109
shear stability testing, and after only 30 passes, both OEM labeled oils sheared out of their starting viscosity grades.
After 90 passes, the Polaris oil lost over 33 percent of its viscosity, while the Arctic Cat oil lost over 30 percent. The AMSOIL product, however, lost less than 5 percent. Its exceptional shear stability allows it to protect high-RPM ATV engines as well as or better than both 50-weight OEM oils.


Both Polaris PS-4 and Arctic Cat's oil fail their own viscosity retention.
As mentioned in the above article - Polaris's Synthetic PS-4 2W50 is nothing more than an effort to confuse and hold customers to the OEM oil. When examined the quality fails to a 40 weight anyway. Choose the real synthetic guaranteed to protect your engine. AMSOIL's performance will impress. Try us and see why!

I don't know where to start but this single product has produced more positive local feedback than any other product I stock other than the PI Fuel additive. It just goes to show the difference in brands.

I have many customers from Texas to South Dakota who comment on the high and low temperature improvements since switching. In Texas especially in Yamaha ATVs the AMSOIL really makes them run smooth when they get hot. No more vibrations. In South Dakota the low temperature properties have people saying their ATVs just feel ready to work right at start-up which has brought us a lot of new customers.

The #1 comment on our synthetic ATV oil is regarding how smooth the engine runs. Almost if they didn't notice the vibration till it was gone. I sum it up as the engine is really running as it was meant to for the first time. With AMSOIL you enjoy base stocks which really hold the moving parts in suspension. That said, AMSOIL AFF ATV oil may be even better for that engine with high wear - Amsoil will make up for the poor viscosity retention the OEM brands exhibit.

It's not always about the tests and ratings - I rate the products by the customer feedback - more power and better throttle response is just what AMSOIL does. Trust the company who specializes in "Better than OEM Performance!"

Resists Heat and Thermal Breakdown
AMSOIL engineered Formula 4-Stroke® PowerSports Synthetic Motor Oil to withstand the high temperatures of recreational engines. It effectively resists oxidation and oil vaporization to prevent carbon/varnish formation, control oil consumption and minimize exhaust emissions. AMSOIL AFF controls oil thickening for good fuel economy, and it keeps engines clean for peak operating efficiency.

Excellent For Transmissions
AMSOIL Formula 4-Stroke® PowerSports 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, delivering maximum torque and power to the wheels – a critical feature for towing or high-horsepower engines. AMSOIL AFF meets the frictional requirements of JASO MA/MA2.

A critical requirement to meet. Look to see if your brand meets JASO MA2 - not likely! Amsoil's Synthetic ATV oil is the best thing on the market for wet clutches.

Superior Wear Protection
AMSOIL AFF is formulated with high levels of anti-wear additives that provide excellent protection for pistons, bearings and gears in transmission containing units, while its shear stable, SAE 40 viscosity delivers a thick lubricating film for an extra margin of protection in hard working engines.

Churning occurs in high RPM engines that can cause oil to foam, depleting its lubricating abilities and increasing heat and wear. AMSOIL AFF controls foam, promoting cooler engine operation and reduced wear.

Special Additives
AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil contains robust dispersant/detergent additives that effectively neutralize the high levels of acids and combustion by-products prone to small engines. And it is anti-rust fortified for superior rust prevention, which is especially important in seasonally or infrequently used power sports equipment.

Applications and Recommendations
AMSOIL Formula 4-Stroke® PowerSports Synthetic Motor Oil is recommended for four-stroke engines and transmissions on two- or four-stroke powered 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 power sports equipment. Manufacturers include Polaris®, Honda®, Yamaha®, Ski-Doo®, Can-Am® (Bombardier®), Suzuki®, Kawasaki® and Arctic Cat®.


AMSOIL Formula 4-Stroke® PowerSports is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil life expectancy and reduce the 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.

Service Life
Follow the equipment manufacturer’s recommended drain intervals.

Health & Safety
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS). An MSDS is available upon request at 715-392-7101 or on the AMSOIL Website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.


Typical Technical Properties


Kinematic Viscosity @ 100°C, cSt (ASTM D-445)


Kinematic Viscosity @ 40°C, cSt (ASTM D-445)


Viscosity Index (ASTM D-2270)


CCS Viscosity, cP @ (-39°C) ASTM D-5293


Flash Point °C (°F) (ASTM D-92)

226 (439)

Pour Point °C (°F) (ASTM D-97)

-51 (-60)

Noack Volatility, % weight loss (g/100g) (ASTM D-5800)


Four Ball Wear Test
(ASTM D-4172B: 40 kg, 75°C, 1200 rpm, 1 hour), Scar, mm


Total Base Number

One Honda ATV owner had some severe trouble with shifting until he switched to AMSOIL 0W40. See the testimonial in the Honda Foreman forum yourself.
Some of the other lads in that forum mention their use of Rotella T Synthetic which is a diesel oil. The posts were in 2006, but what they may not realize now that in 2007 the diesel oil anti wear additive packages and detergents is no longer enough for these types of powersports applications. Diesel CJ4 ratings are designed for specific engine changes which were mandated by the EPA that year. ATV engines must have the higher zinc and detergent levels as they operate under different RPM and temperature extremes.

Other common compatibility match questions from AMSOIL's Powersports department: (call 800-579-0580 to add to your order for optimum savings)

For Polaris owners: Please open this Excel file to see the full Polaris to AMSOIL Suggestions: Polaris to AMSOIL Product Codes

Hub - "Demand Drive" use AMSOIL's ATL (Low Viscosity Automatic Transmission Fluid)

Polaris AGL Plus Transmission fluid: AMSOIL TCC Chain case Oil

Polaris Angledrive (rear) - Use AMSOIL SVG 75W90 GL5

Customers who bought Amsoil's Formula 4-Stroke Synthetic ATV and Snowmobile Oil also bought the following products:

AMSOIL Quick Shot Fuel System Improver

AMSOIL Series 2000 Chain Case Oil

AMSOIL MP Metal Protector and moisture displacement spray.


New entry level synthetic for an easy decision for everyone.Have you NOT tried AMSOIL in your passenger car but would like a low cost high performance warranty compliment synthetic to change at OEM intervals or less? Would you prefer to buy from a true American Company totally focused on quality control and also supports small business and not overseas ventures?
The new AMSOIL OE (Original Equipment) is for you:

AMSOIL OE was designed for our customers who buy AMSOIL products for their "other than passenger car" applications such as motorcycles, diesel trucks, power equipment, farm and work fleet.
These customers don't use AMSOIL in their cars because they wish to change oil frequently and the cost of the once per year oil seems expensive to them if they know they will be draining at more frequent intervals.

Well here it is - the oil which outperforms the on the shelf synthetics yet cost the same or less delivered. You now have no excuse not to use AMSOIL in all your vehicles. If you came to AMSOIL for a special air filter, you can now purchase oil for only a slight change in shipping.

Give us a call and see what a case will cost you! It's much less than the Mobil 1 in the stores. 800-579-0580

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