AMSOIL 15W-50 100% SYNTHETIC METRIC MOTORCYCLE OIL

AMSOIL 15W-50 100% Synthetic Metric Motorcycle Oil delivers premium wear protection, clean engine operation, and smooth wet-clutch performance for four-stroke metric motorcycles that run hard and run hot. Built for sport bikes, cruisers, touring machines, and adventure bikes from BMW, Ducati, KTM, Royal Enfield, Triumph, and Yamaha, this is a purpose-built synthetic 15W-50 motorcycle oil that handles engine, transmission, and clutch duties in a single fill.

Metric motorcycles place unique demands on their oil. A single lubricant has to protect high-revving engine internals, lubricate transmission gears under shock loads, and engage a wet clutch without slipping or glazing. Air-cooled and large-displacement V-twins push oil temperatures even higher, accelerating oxidation and thinning out oils that weren't designed for the job. That combination punishes conventional and lesser synthetic oils quickly.

EXCEEDS HIGH-TEMPERATURE FILM STRENGTH STANDARDS
When cylinder and transmission temperatures climb, oil film strength is the last line of defense between metal surfaces. AMSOIL 15W-50 Synthetic Metric Motorcycle Oil is thermally stable at elevated temperatures and exceeds industry standards for high-temperature film strength. Its high-temperature/high-shear (HTHS) viscosity measures 5.7 cP at 150°C per ASTM D4683, providing a thick, durable protective film even under extreme thermal loads. A Noack volatility of just 3.8% weight loss (ASTM D5800) means the oil resists burn-off and maintains its viscosity over the full service interval. For riders pushing air-cooled BMW boxers, Ducati L-twins, or KTM singles through summer heat or stop-and-go traffic, that translates directly to less oil consumption and more consistent protection.

HEAVY ANTI-WEAR ADDITIVE PACKAGE
Engine wear doesn't wait for ideal riding conditions. Cold starts, high-rpm pulls, and extended idling all create metal-to-metal contact opportunities. AMSOIL loads this formulation with a heavy treatment of anti-wear additives, producing a Four-Ball Wear Test scar diameter of just 0.39 mm (ASTM D4172, 40 kg, 150°C, 1800 rpm, 1 hour). Combined with optimized antioxidant additives engineered to prevent sludge and carbon deposit formation, the oil keeps critical engine components clean while actively reducing wear across the full range of operating conditions.

SMOOTH, CONFIDENT WET-CLUTCH ENGAGEMENT
Wet-clutch motorcycles need an oil with zero friction modifiers. Friction modifiers designed for automotive engines cause clutch slippage, missed shifts, and glazed clutch plates. AMSOIL 15W-50 Metric Motorcycle Oil contains no friction modifiers, meeting JASO MA/MA2 standards for wet-clutch compatibility. The result is positive clutch engagement, smooth shifting under aggressive riding, and reduced heat buildup at the clutch pack. Riders on Triumph Speed Triples, Yamaha MT-series bikes, and BMW R 1250 GS adventure motorcycles will notice the difference immediately in clutch feel and shift precision.

CONTROLS FOAM AT HIGH RPM
At sustained high rpm, oil can aerate and foam as it's whipped through the crankcase and transmission. Foam bubbles collapse between gear teeth and bearing surfaces, leaving momentary gaps in the oil film. AMSOIL addresses this with advanced anti-foam additives. Foam test results per ASTM D892 measure 0/40/0 across Sequences I, II, and III, confirming reliable foam suppression across a wide temperature range. This keeps the oil film intact when it matters most, whether you're winding through canyon roads on a Ducati Panigale or holding highway speeds on a Yamaha FJR1300.

SUPERIOR RUST AND CORROSION PROTECTION FOR STORAGE
Many motorcycle oils overlook corrosion protection, which becomes a real problem during winter storage or extended downtime. AMSOIL 15W-50 Metric Motorcycle Oil contains dedicated anti-corrosion agents and carries a Total Base Number (TBN) of 11.6 (ASTM D2896). That high TBN provides strong acid-neutralizing capacity to guard against internal rust and corrosion even during months of inactivity. The oil passes the ASTM D1748 Humidity Cabinet Rust Test with no rust.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL 15W-50 Synthetic Metric Motorcycle Oil meets API SN and JASO MA/MA2. It is designed for use in BMW, Ducati, KTM, Royal Enfield, Triumph, Yamaha, and other metric motorcycles requiring a 15W-50 motorcycle oil. This oil is not recommended for applications requiring an API GL-4 or GL-5 gear oil. It is Warranty Secure and will not void your motorcycle's factory warranty.

SERVICE LIFE
When paired with an AMSOIL Oil Filter, this oil is good for up to twice the motorcycle manufacturer's recommended change interval in miles or hours, or one year, whichever comes first. When using any other oil filter, change the oil and filter at the manufacturer's recommended intervals. Extended drain intervals are not recommended in racing or modified engines.