I want to ask the differences between the JASO MA MA2 and MB oils.I have checked the JASO website but does not offer much information on this.Also why is it advised to not use JASO MB oil for motorcycles

  • Welcome to the site. Where does it "advised to not use JASO MB oil for motorcycles"? Also, if you need to know which oil is used in your bike, please give us some make/model information.
    – CharlieRB
    Jun 1, 2017 at 11:46
  • Basically down to whether the bike has a wet clutch or not...
    – Solar Mike
    Jun 1, 2017 at 11:51
  • @CharlieRB.The Motul Scooter LE oil has a warning note stating `Do not use for geared motorcycles'
    – DhKo
    Jun 1, 2017 at 12:24

3 Answers 3


According to oilspecification.org, it has to do with friction reducing components.

JASO introduced the MA and MB specification to distinguish between friction modified and non friction modified engine oils.

For motorcycles which share the oil with the engine, clutch and transmission, it is not a good idea to have advanced friction reduction additives that can cause slip. In those cases use the MA type.

Other configurations can use the MB, which has the additives to make it the lowest friction rating.

Bottom line, use what the motorcycle manufacturer recommends.


This should help you : enter image description here

Sourced from : https://passenger.lubrizoladditives360.com/understanding-jaso-ma-and-mb/


For my vespa 125 cc I used castrol power 1 racing fully synthetic 10w-50 it is suitable for scooters we can put this type of oil for scooters are wat if we use wrong grade whether it will damage engine are wat. It is very high grade oil because in India temperature crosses around 45°cesius normally in summer so scooter oil losses it viscosity in extreme temperature. So I changed my grade to 10w-50 fully synthetic

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