I used the valvoline for a while because it was cheap, actually got a **** load of it at pep boys once because they had a case of atv and a case of v twin motorcycle oil on the clearance rack at $1.50 a bottle and I bought all of it. I could tell a pretty big difference switching from Silkolene to the cheap valvoline, it didn't shift right, ran hotter, and the oil did break down very quickly in comparison. I don't know if it was a coincidence or not but after the second oil change with valvoline i hit the track and magically my clutch started slipping and needed replaced, never used the stuff again after that, just used it in my lawn mower to use it up. I have always used Silkolene or Maxima but i'm thinking about trying out the Rotella this summer and seeing how my bikes like it.