I too run Rotella T4 15w-40. I use it in a Beta 250rr, KTM 150 xc, YFZ450 and a Grizzly 660. I have used it in every two stroke bike I have had. (many) They definitely use a new formula. It says it meets the JASO MA/MA2 requirements, but it sure doesn't act like the older formula. It seems that...