MA vs. MB and the need for dedicated lubricants
In the most basic terms, JASO MA and MB are differentiated by whether a lubricant is suitable for a wet clutch or not.

In 2006, in order to differentiate within JASO MA lubricants it was further divided between MA1 and MA2, with MA2 lubricants delivering the higher friction performance, enabling oil marketers to take advantage of evolving lubricant and additive technology for specific performance attributes. MB lubricants can be formulated with friction modifiers to contribute to greater fuel economy in Automatic Transmission (Scooter) applications.

Selecting the right additive chemistry for JASO MA and MB lubricants ensures the necessary performance in specific applications.

For oil marketers, selecting the right additive chemistry for each classification is critical for ensuring the necessary performance in specific applications. Communicating these benefits and considerations to end users is also important-while JASO MA lubricants are in fact suitable for all applications, MB lubricants may induce clutch slippage in motorcycles and must only be used in scooters.

JASO MB – Für Motorräder mit Trockenkupplung bzw. separat geschmiertem Getriebe (4-Takt-Motoren)

speziell für automaten mit trockenkupplung

und dass es aktuell nur sehr wenige öle gibt