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AMSOIL Synthetic Formula 4-Stroke® 0W-40 PowerSports Motor Oil

AMSOIL Formula 4-Stroke® 0W-40 Synthetic ATV and Motorcycle Oil

Product Code: AFF

EW AMSOIL Formula 4-Stroke Motor Oil is specially formulated to provide serious protection and performance in recreational 4-stroke engines, including ATV's, outboard motors, snowmobiles, and motorcycles.

With a broad 0W-40 viscosity rating, AMSOIL Formula 4-Stroke is ideal for use in both hot and cold temperature extremes. As an SAE 40 motor oil, it protects hot operating, hard-working 4-stroke engines, while its SAE 0W rating ensures excellent cold weather starting and quick post-start lubrication in the coldest temperatures.

AMSOIL Formula 4-Stroke Synthetic Motor Oil's friction modifier-free formulation is ideal for 4-stroke ATV's, outboard motors, and motorcycle engines, ensuring dependable starting, smooth running, improved fuel efficiency, desirable stall speeds, and clutch compatibility.

AMSOIL Formula 4-Stroke Synthetic Motor Oil provides superior shear stability and resistance to vaporization. Engine wear, oil consumption, heat, and emissions are kept to an absolute minimum.

The high-temperature operation of 4-stroke engines often leads to the thermal degradation and oxidation of conventional oils, leading to the formation of deposits, sludge, and varnish. However, the superior oxidative and thermal stability of AMSOIL Formula 4-Stroke Synthetic Motor Oil inhibits the formation of varnish, sludge, and deposits so equipment runs clean in high-stress, high temperature conditions.

The pollution and noise emitted from 2-stroke snowmobiles and dirt-bikes has come under heavy criticism in recent years, with manufacturers working to perfect cleaner, quieter 4-stroke counterparts. As 4-stroke snowmobiles and dirt bikes enter the market, they will require a superior lubricant. AMSOIL Dealers now offer superior 100% synthetic AMSOIL Formula 4-Stroke Motor Oil.

AMSOIL Formula 4-Stroke Synthetic Motor Oil provides second-to-none protection and performance in Yamaha®, Suzuki®, Honda®, Mercury®, Kawasaki®, Arctic Cat®, Polaris®, Nissan®, and Bombardier® motors and transmissions specifying 0W-40, 5W-30, 10W-30, and 10W40 viscosity grades. AMSOIL Formula 4-Stroke Synthetic Motor Oil is also safe for use in wet or dry sumps and is recommended for manual or automatic clutches, and with clutch plates in ATV's and motorcycle transmissions. Drain AMSOIL Formula 4-Stroke at manufacturer's recommended intervals.

  • API SJ, SH, SG, SF, CD, CF
Q and A About Formula 4-Stroke Motor Oil

Q. Can I use AMSOIL AFF 0W-40 in my new 4-stroke snowmobile?
A. Absolutely! AMSOIL AFF 0W-40 was specifically formulated for use in small, hard working 4-stroke engines. AFF is ideal for 4-cycle snowmobiles, ATV's, personal watercraft, 4-stroke boat motors, lawn equipment etc...

Q. Can I use AMSOIL AFF 0W-40 in my car or truck?
A. YES. AMSOIL AFF 0W-40 can be used in in any gasoline 4-stroke automobile engine. Recommended change intervals are at 7500 miles, or 6 months. AMSOIL AFF can also be used in diesel powered cars or trucks, with change intervals as recommended by your vehicle manufacturer.

Technical Specifications Table

Table of Oil Drain Interval Recommendations


  • AFFQT-EA, quart
  • AFFQT-CA, 12-quart Case
Secure Order Link

For retail pricing information:

  • Go to the ASMOIL On-Line Store through the link above
  • Email me at .
  • Fax me at: 270-522-0512

If You Prefer To Order by Phone: TOLL FREE: 1-800-956-5695 (See Telephone Order Page).
Customer Ordering Number: 522955

Check here for discount pricing plan.

Figure amount in Canadian Dollars.
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