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

AMSOIL Formula 4-Stroke Powersports 0W-40 Synthetic Motor Oil is a purpose-built synthetic lubricant engineered for four-stroke ATVs, UTVs, and snowmobiles that need one oil to handle engine, transmission, and wet-clutch duties across extreme temperature swings.

Powersports engines operate under conditions that destroy conventional oils fast. High RPM, air-cooled or semi-liquid-cooled designs, shared oil sumps with transmissions, and long periods of seasonal storage all compound the problem. Add in sub-zero cold starts on a February trail ride followed by sustained wide-open-throttle runs, and you have an environment that demands a lubricant specifically formulated for these machines, not repurposed from automotive applications.

PROTECTS ACROSS EXTREME TEMPERATURE SWINGS
A 0W-40 viscosity range is unusually broad, and that breadth is the point. The 0W cold-cranking rating and a pour point of -58°F (-50°C) mean this oil flows immediately on startup in deep winter conditions, protecting pistons, bearings, and cylinder walls before the engine reaches operating temperature. Once hot, the SAE 40 viscosity grade delivers a thick, shear-stable lubricating film that holds up under sustained high-RPM operation. For snowmobile riders running Ski-Doo ACE 900 or Yamaha Sidewinder four-strokes in northern climates, and for ATV/UTV owners pushing Honda Ranchers or Polaris Sportsmans through summer heat, this single oil covers both ends of the spectrum without compromise.

PROVEN WEAR AND DEPOSIT PROTECTION
AMSOIL subjected this oil to 100 hours of extreme dyno testing, equivalent to 3,421 miles (5,028 km), and it delivered exceptional protection against both wear and deposit formation. The formulation uses high levels of anti-wear additives to protect pistons, bearings, and transmission gears in shared-sump powersports designs. Four-Ball Wear Test results (ASTM D4172B, 40 kg, 75°C, 1200 rpm, 1 hr) produced a wear scar of just 0.36 mm, confirming the oil's ability to maintain a protective barrier under load. Noack Volatility testing (ASTM D5800) showed only 7.8% weight loss, meaning less oil is burned off at high temperatures, which translates to lower oil consumption and reduced carbon and varnish buildup on pistons and valves.

WET-CLUTCH COMPATIBLE, NO FRICTION MODIFIERS
Many powersports engines share their oil supply with the transmission and wet clutch. Automotive oils typically contain friction modifiers that cause clutch slippage in these designs, robbing power and accelerating clutch plate wear. AMSOIL Formula 4-Stroke is formulated without friction modifiers and meets JASO MA/MA2 frictional requirements. This prevents clutch slippage and helps deliver maximum torque and power to the wheels. Owners of Can-Am Outlanders, Kawasaki Brute Forces, and Suzuki KingQuads with wet-clutch transmissions can run this oil confidently knowing it will maintain proper clutch engagement.

CONTROLS FOAM IN HIGH-RPM ENGINES
Powersports engines routinely operate at RPM levels that would destroy an automotive drivetrain. This high-speed operation churns oil aggressively, introducing air and creating foam. Foamy oil loses its load-carrying capacity and increases operating temperatures. Formula 4-Stroke Powersports Oil includes anti-foam additives that keep the oil stable under these conditions, promoting cooler operation and consistent lubrication.

RUST PROTECTION FOR SEASONAL STORAGE
Most powersports equipment sits idle for months at a time. Condensation builds inside the engine during storage, and without adequate corrosion inhibitors, internal surfaces rust. This oil is anti-rust fortified specifically for this scenario, protecting cylinder walls, bearings, and gear surfaces during extended downtime between riding seasons.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL Formula 4-Stroke Powersports 0W-40 meets API SN, SM, SL/CF, SJ, SH, SG, JASO MA/MA2, and ISO-L-EMA2. It replaces 0W-30, 0W-40, 5W-30, 5W-40, 10W-30, and 10W-40 viscosities in four-stroke powersports applications, including equipment made by Polaris, Honda, Yamaha, Ski-Doo, Can-Am (Bombardier), Suzuki, Kawasaki, and Arctic Cat. It is compatible with other synthetic and conventional motor oils, though mixing will reduce the oil's performance benefits and life expectancy. Aftermarket oil additives are not recommended.

SERVICE LIFE
Follow the equipment manufacturer's recommended drain interval.