AMSOIL Advanced Synthetic 10W-40 Motorcycle Oil is engineered for maximum performance in 4-stroke engines and motorcycle transmissions, both two- and four-stroke. It is wet clutch compatible and features excellent heat resistance and wear protection. AMSOIL Synthetic 10W-40 Motorcycle Oil is Shear Stable. It stops viscosity breakdown (loss), protects gears and meets SAE 80W/90, API GL-1 gear oil requirements. API SG, SL/CF/CG-4JASO MA/MA2ISO-L-EMA2