Motorcycle Gear and Diff Oils
AMSOIL synthetic motorcycle gear and driveline oils are engineered for transmissions, gearcases and final drives that require lubrication separate from the engine. Advanced synthetic formulations provide excellent wear protection, resist viscosity loss and maintain dependable lubrication under high temperatures and demanding riding conditions.
Browse the AMSOIL motorcycle gear and differential oil range below for specialised lubricants designed to protect highly loaded gears, bearings and other motorcycle driveline components.
AMSOIL Motorcycle Gear & Differential Oils
Motorcycle drivetrain lubrication varies considerably between different designs. While many motorcycles use engine oil to lubricate the engine, transmission and wet clutch together, others use separate lubricants for the transmission, primary drive, final drive or differential. These separate systems can require purpose-designed gear lubricants rather than conventional motorcycle engine oil.
AMSOIL offers synthetic gear and drivetrain lubricants for motorcycles requiring separate transmission, primary or final-drive fluids, including applications found in V-Twin motorcycles, shaft-drive motorcycles and other specialised drivetrain designs.
Shared and Separate Lubrication Systems
There is no single lubrication arrangement common to every motorcycle. Many Japanese and European motorcycles use a shared engine and transmission lubricant, while other designs separate the engine oil from the transmission or primary drive. Shaft-drive motorcycles may also have a separate final-drive gearcase requiring its own lubricant.
For this reason, the correct product depends on the design of the motorcycle and the requirements of each individual component. A lubricant suitable for one part of the drivetrain should not automatically be used elsewhere in the motorcycle.
Transmission and Primary Drive Lubrication
Motorcycles with separate transmissions place substantial mechanical loads on their lubricants as gear teeth repeatedly transmit engine torque through a relatively compact gearbox. The lubricant must maintain a protective film between heavily loaded components while providing the viscosity and operating characteristics required by the transmission.
Some V-Twin motorcycles also use a separate primary drive containing the clutch and primary chain. These applications can have different friction and lubrication requirements from both the engine and transmission, making it important to use a fluid suitable for the specific system.
Shaft Drives and Final-Drive Gear Oils
Shaft-drive motorcycles typically use a separate final-drive gearcase to transmit power to the rear wheel. These assemblies can contain heavily loaded gears requiring dedicated gear oil and should be serviced independently from the engine and transmission according to the motorcycle manufacturer's recommendations.
Always check the required viscosity and lubricant specification rather than selecting a gear oil on viscosity alone. Where an API GL classification is specified, our guide to API GL-4 and GL-5 gear oils explains why the two classifications should not automatically be considered interchangeable.
Find the Correct Motorcycle Drivetrain Lubricants
Use the AMSOIL Vehicle Product Finder to identify the recommended engine, transmission, primary and final-drive lubricants for your motorcycle. Checking each component separately is particularly important on motorcycles that use multiple lubricant types.
