AMSOIL FORMULA 4-STROKE POWERSPORTS 0W-40 SYNTHETIC MOTOR OIL

Six grade call-outs, one bottle

Use it in four-stroke engines and transmissions in powersports applications that require 0W-30, 0W-40, 5W-30, 5W-40, 10W-30, or 10W-40 oil. ATVs, UTVs, and snowmobiles all show up on the application list, along with machines built by Polaris, Honda, Yamaha, Ski-Doo, Can-Am, Suzuki, Kawasaki, and Arctic Cat. A broad viscosity range and a wax-free formulation are what let one product answer six call-outs.

That breadth is coverage, not permission to skip the manual. Your machine has to require one of the six listed grades and one of the listed specifications, and an application naming anything outside that set stays outside the product. Where your manual does name one, a single bottle can serve the quad, the side-by-side, and the sled sitting in the same garage.

The specification list on the label

The label carries API SN, SM, SL/CF, SJ, SH, and SG, plus JASO MA/MA2 and ISO-L-EMA2. API categories describe engine oil performance, and a run of them listed together means coverage of machines specified against older categories as well as newer ones. JASO MA and MA2 cover frictional behavior in a shared wet-clutch sump, and ISO-L-EMA2 comes from the international classification for four-stroke motorcycle engine oils.

Clearing a long list does not settle the fit by itself. Specification coverage and viscosity requirement are separate questions, and an oil can meet every performance mark your machine names and still be the wrong grade for it. Your manual settles the grade first, then the specification list settles whether this oil answers it. AMSOIL products are backed by a Limited Liability Warranty.

Cold cranking, then a shear-stable SAE 40 when hot

Cold-cranking simulator viscosity is 5,805 cP at -35°C under ASTM D5293. That test measures the drag the oil puts on a shaft turned inside a close-fitting cell, which is the closest laboratory analogue to a starter spinning an engine on a cold morning. Lower numbers mean less load on the starter and quicker oil movement in the first seconds of running.

Pour point is -50°C (-58°F) under ASTM D97. Together with the 0W rating it supports easy cranking, cold-weather starting, and quick post-startup protection. A wax-free formulation keeps flow available down there, since wax crystals are what thicken a conventional base oil as it chills. Pour point is still a laboratory flow property, so for deep cold, follow the seasonal guidance in your equipment manual.

Kinematic viscosity is 87.0 cSt at 40°C and 14.8 cSt at 100°C under ASTM D445, with a viscosity index of 179 under ASTM D2270. The shear-stable SAE 40 viscosity puts a thick lubricating film in place for an extra margin of protection in hard-working engines, which is how a 0W oil can be specified where a 10W-40 is named. Shear stability is what decides whether it stays a 40 weight after a season of work.

Shared sumps, gears, and wet clutches

High levels of anti-wear additives protect pistons, bearings, and gears in transmission-containing units, which describes most powersports machines, where the engine and gearbox draw from one sump. Gear teeth load a narrow sliding contact while a bearing spreads its load across a film the shaft maintains by turning, so one fill has to handle both jobs at once.

The wet-clutch-compatible formulation helps prevent clutch slippage, which keeps torque and power moving to the wheels instead of getting lost across the plates. Foam control handles a separate problem common to high-rpm engines, where churning whips air into the oil. Aerated oil carries less load and less heat, so keeping foam down promotes cooler operation and reduced wear.

Robust dispersant and detergent additives neutralize the acids and combustion byproducts powersports engines are prone to producing. Noack volatility is 7.8 percent weight loss under ASTM D5800 and flash point is 234°C (453°F) under ASTM D92. Noack measures what evaporates from a heated sample, which shows up in service as oil consumed between top-ups, while flash point is a property of the fluid rather than an operating limit for an engine.

The 100-hour dyno run, storage, and packaging

Extreme dyno testing ran 100 hours, equal to 3,421 miles or 5,028 km, and the oil delivered exceptional protection against wear and deposits across that stretch. The number describes one instrumented program rather than a drain interval, and it does not transfer to a particular machine in the field. Keep drain timing on the equipment manufacturer recommended interval, and expect no extended interval once oils have been mixed.

Anti-rust fortification protects components from rust during storage, which is the reality for seasonal equipment. A sled parked in April and a UTV that sits between hunting seasons both spend more calendar time still than running. Rust forms on internal surfaces while an engine sits rather than while it works, so part of the additive package is aimed squarely at that idle stretch.

Three codes cover the oil. AFFQT-EA is the quart bottle, AFFQT-CA is the case of twelve quarts, and AFF55-EA is the 55 gallon drum. Compatibility with other synthetic and conventional motor oils covers a top-up, though aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils. Recycle used oil and the empty bottle once the service is done.

Verified specifications