Ok ... Ive used mobil in everything just cuz its good protection. Never really noticed any gain or improvement in anything. TIL NOW!!! Whoohooo.. the bus shifts like a dream... big difference. And the clutch seems to engage smoohter too. I did a couple lil tuneups... amzing what the small things effect. Raised the idle from 900ish to 1100ish... much nicer... took the slop out of the thottle cable... again..... nice !!! sj