Motorcycle Glossary
JASO (MA, MA2, MB)
In short
JASO T903 is the Japanese standard that classifies four-stroke motorcycle oils by their compatibility with wet clutches: MA, MA1, MA2 and MB.
- JASO MA, MA1, MA2: high-friction oils for motorcycles with wet clutches. MA2 defines the highest friction range.
- JASO MB: low-friction oil for some scooters whose clutch does not run in engine oil. It must not be used in wet-clutch engines.
Two-stroke oils use a separate JASO classification (FB, FC, FD). The correct class is given in the owner's manual; the oil container shows the JASO code with a registration number.
Also known as (including Turkish names)
- JASO MA2
- JASO MB
- JASO T903
Related products
Engine Oils
Last updated: October 9, 2026
