Interesting that everyone keeps saying that T4 and T6 are JASO MA rated, but they are not.
Rotella T4 and T6 labels state "Meets the performance requirements of: ... JASO MA/MA2".
"Meets requirements of" is not the same thing as JASO MA/MA2 licensed/certified.
Where on the bottle is the MA rating square with their certification number?
All JASO MA/MA2 certified oils will have that, just like this bottle of Honda oil:
Where is any Rotella on the JASO MA/MA2 licensing list
While I agree Rotella (and Delo, and most other HDEO) work great in most wet clutch bikes and most likely meet or exceed the MA/MA2 specs, none of them are JASO MA/MA2 licensed.
I am running Peak Syn-Blend 15w-40 HDEO in my bike right now, and it says nothing on the label about JASO MA at all. I have no issue using it, but I also know it is not designed for it.
Some "motorcycle" oils from Mobil, Castrol and Valvoline also are not MA licensed oils. Again, check the list or look at the back of the bottle.
I believe the JASO rating is up to the manufacturer...? I'm looking at a year old bottle of Mobil1 Vtwin with a outline of a Harley type bike on the front and JASO is nowhere to be found..
Nope. As you mentioned, the Mobil 1 V Twin is for Harley bikes, so no need for the JASO MA/MA2 certification. Probably works fine in wet clutches, but not certified for it.
and to be clear, I have nothing against using Rotella in a wet clutch bike, just the fact that everyone seems to be thinking that advertising wording on the label and website is the same thing as having the correct licensing/certifications. You have as much of a guarantee from Shell using T4, T5 or T6, since non of them are JASO MA/MA2 licensed.
Why they have this wording on T4 and T6, well, easy to see, it sells. Why is it not on T5, no idea.