New formula for 2026. Meets API SP, JASO MA/MA2 and GL-1 specifications. Ideal for street, touring, adventure and racing motorcycles. Compatible with catalytic converters.
AMSOIL 10W-40 Motorcycle Oil Package Sizes Include:
1-Quart Bottles (or buy case of 12)
1-Gallon (or buy case of 4)
55-Gallon Drum
AMSOIL 100% Synthetic 10W-40 Motorcycle Oil delivers world-class performance and protection for any motorcycle requiring a 10W-40. Enjoy responsive power delivery and ultra-smooth shifting performance. Protects your investment and optimizes your riding experience.
Looking for prices? We can’t publish AMSOIL’s wholesale prices. Request a wholesale price list using the contact form on this page.
For motocross and dirt bikes, see AMSOIL Synthetic 10W-40 Dirt Bike Oil
Features And Benefits Of AMSOIL 100% Synthetic 10W-40 Motorcycle Oil
- Synthetic formula reduces friction
- Offers powerful wear protection
- Delivers smoother gear shifting
- Compatible with all wet-clutches
- Safe for models equipped with catalytic converters
- Will not thin-out in extreme heat
- Designed to stay in service for twice as long as other 10W-40 motorcycle oils
- Contains ingredients to prevent internal rust during storage
- Defends against deposit, varnish and sludge formation
- Combats heat-related oil consumption
Professional-Grade Wear Protection
There is no greater test for a motorcycle oil than professional motorcycle racing. AMSOIL 100% Synthetic 10W-40 Motorcycle Oil delivers steady protection for these engines. AMSOIL starts with a shear-stable 100% synthetic base oil and then loads it anti-wear additives that will not fail in the face of extreme loads and hard gear mashing. Even if you do not push your bike to the limit, there is no better way to protect your investment for many years to come.
Protects Transmissions And Clutches
The low-wear capabilities of AMSOIL 100% Synthetic 10W-40 Motorcycle Oil also extends to transmissions. This 10W-40 contains powerful anti-wear additives that prevent metal-to-metal wear. AMSOIL MCF 10W-40 also lengthens clutch plate life due to its ability to stabilize operating temperatures. This product does not contain friction modifiers, making it 100% wet-clutch compatible.
Low Friction Equals High Performance
The low-friction properties of AMSOIL 100% Synthetic 10W-40 Motorcycle Oil improves your riding experience on a number of fronts. Expect smoother, cooler operation with responsive power delivery. This also sets the stage for improved fuel economy. The lower friction offered by this 10W-40 motorcycle oil also results in smoother, more precise gear changes, even in extreme heat.
Protects From Rust During Long Off-Season
The protective properties of AMSOIL 100% Synthetic 10W-40 Motorcycle Oil don’t stop when you put your bike away in the fall. This product contains powerful anti-rust and corrosion additives. Therefore, your motorcycle’s engine and transmission are protected from rust and corrosions formation during long storage periods.
Suitable Applications for AMSOIL 100% Synthetic 10W-40 Motorcycle Oil
- This 10W-40 synthetic motorcycle oil by AMSOIL is suitable for 4-stroke air-cooled or liquid-cooled motorcycle, ATV, Side-By-Side or UTV engines.
- Suitable for 2-stroke or 4-stroke transmissions requiring SAE 80W/90 or API GL-1 gear oil. Compatible with wet-clutches.
- Recommended for motorcycle/ATV brands such as Yamaha, Suzuki, Honda, Kawasaki, BMW, KTM, Victory, Husqvarna, Triumph, Moto Guzzi, CF Moto, Ducati, Benelli, Royal Enfield, Aprilia, Arctic Cat, Can-Am Spyder, Polaris or other motorcycles where the suggested motorcycle engine oil is 10W-40.
- Meets or exceeds the following specifications: API SP; JASO MA/MA2; API GL-1
- Not recommended for applications requiring an API GL-5 or GL-4 gear oil.
Mixing AMSOIL 100% Synthetic 10W-40 Motorcycle Oil With Other Brands
AMSOIL 100% Synthetic 10W-40 Motorcycle Oil is compatible with all other brands of conventional, semi-synthetic and synthetic motorcycle engine oils. While you can safely mix AMSOIL Synthetic Oil with other brands, this will reduce the drain interval and performance capabilities of AMSOIL oil.
The use of any aftermarket oil additives is definitely NOT recommended.
Service Life for AMSOIL 100% Synthetic 10W-40 Motorcycle Oil
- Capable of service life of up to twice the oil change interval as suggested by your owner’s manual or one full year (whichever comes first) in motorcycle engines and transmissions.
- When using any engine oil filter other than an AMSOIL Motorcycle Oil Filter, change the oil filter at the manufacturer’s recommended service interval. AMSOIL Motorcycle Oil Filters are designed with the capability of staying in service for the duration of the maximum drain interval of AMSOIL 100% Synthetic 10W-40 Motorcycle Oil.
- Off-road service: change this product at the motorcycle manufacturers’ suggested service intervals.
- Racing service or modified engines: extended oil drain service intervals are not recommended.
- When mixing other motorcycle oil brands with AMSOIL, revert to the manufacturer’s recommended service interval.
Specifications | |
100% Synthetic 10W-40 Motorcycle Oil (MCF) | |
| Kinematic Viscosity @ 100°C, cSt (ASTM D-445) | 14.4 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D-445) | 88.5 |
| Viscosity Index (ASTM D-2270) | 166 |
| Fire Point °C (°F) (ASTM D-92) | 256 (493) |
| Flash Point °C (°F) (ASTM D-92) | 238 (460) |
| Pour Point °C (°F) (ASTM D-97) | -48 (-54) |
| High Temperature/High Shear Viscosity @ 150°C , 1.0 x 106 s-1 (ASTM D 4683), cP | 3.8 |
| Four Ball Wear Test (ASTM D-4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour), Scar in mm | 0.45 |
| Noack Volatility, % weight loss (g/100g) (ASTM D-5800) | 5.8 |
| Foam (ASTM D-892, Sequence I, II & III | 0/10/0 |
| Rust Test – Humidity Cabinet (ASTM D-1748) | No Rust, PASS |
| Total Base Number | 10.8 |
