JASO M345 Wikipedia ...
JSAE Paper Number: m342-18e Mar, 2018 Issued No.M342-18 JASO Standards(English): M - Material and surface treatment (Two-stroke-Cycle Gasoline Engine ? Engine Oils ? JASO introduced the MA and MB specification to distinguish between friction modified and non friction modified engine oils. Most four-stroke motorcycles with wet clutches need a JASO MA oil. JASO MA Japanese standard for special oil which can be used in 4-stroke motorcycle engine with one oil system for engine, gearbox and wet clutch system. […]