Motorcycle transmission fluid is essential for ensuring proper operation of the gearbox and, in some cases, the clutch and differential, especially in two-stroke engines or systems with a separate gearbox.
Types of motorcycle transmission oil
🏍 2-stroke motorcycles (with separate gearbox)
Transmission oil is only used for the gearbox and clutch , as the mixture lubricates the engine.
Recommended type : 2-stroke motorcycle gearbox oil (often 10W30, 75W90 or similar)
🏍 4-Stroke Motorcycles
They often use a single engine oil that lubricates everything (engine, gearbox, clutch).
Recommended type : 4T engine oil with JASO MA/MA2 specifications (compatible with wet clutches).
🛠 Motorcycles with separate gearboxes (e.g. BMWs, some Harleys)
You need a dedicated transmission oil (e.g. 75W90 or 80W90), often specifically for gears.
Recommended type : Gearbox oil (GL-4 or GL-5 depending on specification).
🔍 What to check before buying
- Transmission type (integrated or separate)
- User manual specifications (viscosity, type, API/JASO standards)
- Compatibility with wet clutch (if present)
