Flip over any bottle of motorcycle oil and you'll find a JASO rating. It's the one credential that actually matters for most bikes — here's what it means in plain English.
The problem JASO solves
Most motorcycles run a wet clutch: the clutch plates are bathed in engine oil. That means the oil must be slippery enough to protect the engine but grippy enough that the clutch still bites. Car oils fail this test on purpose — they're loaded with friction modifiers to chase fuel-economy numbers. Put one in a wet-clutch bike and the clutch slips, glazes, and dies.
JASO (the Japanese Automotive Standards Organization) created the T903 friction test to certify oils for wet clutches.
MA vs MA2 vs MB
- JASO MA2 — the highest friction rating. Best clutch grip and shift feel. This is what you want on a modern street bike.
- JASO MA / MA1 — passes the wet-clutch test at a lower friction band. Fine, but MA2 is better.
- JASO MB — lower friction, for scooters with belt drives and dry clutches only. Never use MB in a wet-clutch motorcycle.
Which Motul oils carry MA2
Motul's entire 4-stroke motorcycle line is built around JASO MA2: 5100 semi-synthetic, 7100 full synthetic, and 300V Factory Line (300V is engineered for racing friction targets — check the spec table on each product page). The TWIN V-twin line covers Harleys and cruisers. Every product page in our Powersports Oil collection lists its JASO and API standards in the specs table.
The 10-second buying rule
- Wet-clutch motorcycle → JASO MA2 on the label. No exceptions.
- Viscosity → whatever your owner's manual says. The manual beats the internet.
- Tier (5100 / 7100 / 300V) → match to how you ride. Our motorcycle oil guide breaks it down.