AMSOIL 10W-40 100% Synthetic Metric Motorcycle Oil

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AMSOIL 10W-40 100% Synthetic Metric Motorcycle Oil

AMSOIL 10W-40 100% Synthetic Metric Motorcycle Oil (MCF) is the popular SAE 10W-40 synthetic for four-stroke metric sport bikes, cruisers, touring, and adventure motorcycles that share a single sump for the engine and transmission. The formulation meets API SN, API GL-1, and JASO MA/MA2, so it is wet-clutch compatible and built for the heat, shear, and high-rpm operation of modern Honda, Yamaha, Kawasaki, Suzuki, BMW, Triumph, and Can-Am machines that call for a 10W-40 motorcycle oil.

Wet-clutch friction control with no friction modifiers

Metric motorcycle wet clutches need a JASO MA/MA2 motorcycle oil, not a passenger-car formulation. Modern car oils carry friction modifiers that promote fuel economy in dry-clutch drivelines and can cause clutch slippage and chatter in shared-sump motorcycle engines. AMSOIL 10W-40 Synthetic Metric Motorcycle Oil contains no friction modifiers and is engineered to control heat and prevent slippage and glazing for positive clutch engagement and longer clutch life.

High-temperature film strength for engine and transmission

Metric four-strokes share one sump with hardened transmission gears, so the oil has to lubricate the engine top end and act like a gear lube under the same drain interval. Kinematic viscosity at 100 degrees C measures 14.6 cSt with a viscosity index of 165 (ASTM D445 and ASTM D2270), keeping the oil firmly in the SAE 10W-40 range across the temperature swing of city traffic, canyon runs, and long touring days. High-temperature, high-shear viscosity is 4.7 cP at 150 degrees C (ASTM D4683), and the Four-Ball Wear Test (ASTM D4172) returns a 0.37 mm scar diameter at 40 kg, 150 degrees C, 1800 rpm for one hour.

Volatility resistance and deposit control

NOACK volatility (ASTM D5800) measures 7.2 percent weight loss for the 10W-40 grade, which limits how much of the oil flashes off in the hottest parts of the engine, controls oil consumption between changes, and reduces deposits on pistons, ring lands, and valve guides. Optimized antioxidant additives prevent damaging sludge and carbon deposit formation for cleaner internals over the full service interval. The flash point is 230 degrees C (446 degrees F) and the fire point is 240 degrees C (464 degrees F) per ASTM D92.

Anti-foam protection for high-rpm operation

High-rpm operation causes some motor oils to foam where the crankshaft and primary gears whip air into the lubricant, and foam bubbles collapse between gear teeth, allowing metal contact and accelerated wear. AMSOIL 10W-40 Synthetic Metric Motorcycle Oil contains advanced anti-foam additives, with measured Foam Sequence I, II, and III results of 0/20/0 (ASTM D892).

Rust and acid corrosion protection during storage

Many metric bikes spend long stretches parked, and short trips never bring the oil up to a temperature that boils off moisture. AMSOIL 10W-40 Synthetic Metric Motorcycle Oil contains specific anti-corrosion agents and passes the ASTM D1748 humidity cabinet rust test (No Rust, Pass). A high total base number of 11.6 (ASTM D2896) neutralizes the acids that form during combustion and short-trip condensation, helping protect bearings and maintain internal cleanliness over the full drain interval.

Recommended applications and service intervals

AMSOIL 10W-40 Synthetic Metric Motorcycle Oil is recommended for BMW, Can-Am, Honda, Kawasaki, Suzuki, Triumph, Yamaha, and other motorcycles that require a 10W-40 motorcycle oil meeting API SN, API GL-1, and JASO MA/MA2. Typical applications include Honda CBR, VFR, and Gold Wing, Yamaha YZF, MT, and FZ, Kawasaki Ninja, Z, and Versys, Suzuki GSX-R and Bandit, BMW S1000 and F-series, and Triumph Bonneville and Speed Triple variants that spec SAE 10W-40 motorcycle oil. The 10W-30 grade in the same family fits cooler-climate Honda, Kawasaki, Suzuki, and Yamaha applications; the 15W-50 grade serves BMW, Ducati, KTM, Royal Enfield, Triumph, and Yamaha bikes that spec a heavier oil.

• Pair with an AMSOIL Oil Filter for service up to twice the motorcycle manufacturer-recommended change interval (miles or hours) or one year, whichever comes first.
• When fitted with any other oil filter, change the oil and filter at the standard motorcycle manufacturer-recommended interval.
• Extended drain intervals are not recommended in racing or modified engines; oil changes are at the owner's discretion.
• Not recommended for applications that require an API GL-4 or GL-5 gear oil; match the right product with the AMSOIL vehicle lookup guide.

AMSOIL 10W-40 Synthetic Metric Motorcycle Oil is compatible with other synthetic and conventional motor oils, but mixing shortens service life and reduces performance benefits, and extended drain intervals are not supported on mixed fills. Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Metric Motorcycle Oil.

Typical technical properties

Order AMSOIL 10W-40 100% Synthetic Metric Motorcycle Oil

AMSOIL 10W-40 100% Synthetic Metric Motorcycle Oil ships in a quart bottle (MCFQT-EA), case of twelve quarts (MCFQT-CA), gallon jug (MCF1G-EA), and 55 gallon drum (MCF55-EA). The product is Warranty Secure, keeping the factory warranty intact when used as a high-performance replacement for vehicle manufacturer branded oils, and is backed by the AMSOIL Limited Warranty. For year, make, and model application match, start with the AMSOIL vehicle lookup guide, and for cross-grade comparison across 10W-30, 10W-40, 5W-40, and 15W-50 metric grades plus V-Twin, dirt bike, and scooter formulas, see the AMSOIL motorcycle oil guide. Order Now.

Frequently asked questions