I'm using mobil vtwin in mine but I think I'm gonna go back to regular oil. Seems mine is using about a 1/2 quart a ride and at 8 bucks a quart its getting kinda expensive. Wouldnt be bad if I knew where its going but I really think there are little gremlins drinking it out at night or something. I've never noticed it smoking and I'm not a wheelie king so unless its blowing that much up thru the crankcase breather I dont know where its going