Referring to the JASO MA spec http://www.oilspecifications.org/articles/JASO_MA_JASO_MB.php
I never see any oil that is JASO MA1 rated. Seems all are either MA or MA2
Looking at the spec, MA is split into MA1 and MA2:
JASO MA
Dynamic Friction Characteristic Index (DFI)
>=1.45 and
JASO MA1
Dynamic Friction Characteristic Index (DFI)
>=1.45 and
JASO MA2
Dynamic Friction Characteristic Index (DFI)
>=1.8 and
I understand that if the oil meets some MA1 and some MA2 it is rated as MA but I am curious why no JASO MA1 oils or at least none on the certified list. And if there are no MA1 oils then why have the spec? Why not just MA and MA2?
I never see any oil that is JASO MA1 rated. Seems all are either MA or MA2
Looking at the spec, MA is split into MA1 and MA2:
JASO MA
Dynamic Friction Characteristic Index (DFI)
>=1.45 and
JASO MA1
Dynamic Friction Characteristic Index (DFI)
>=1.45 and
JASO MA2
Dynamic Friction Characteristic Index (DFI)
>=1.8 and
I understand that if the oil meets some MA1 and some MA2 it is rated as MA but I am curious why no JASO MA1 oils or at least none on the certified list. And if there are no MA1 oils then why have the spec? Why not just MA and MA2?
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