I didn't want to own up to it but I was the one to put regular oil in it! It was when I first got it and the manual calls for 10w40 and (if i remember correctly) doesn't specify the JASO MA or SL rating. So yeah that was exactly what I thought had happened! I had always thought that i got away with my mistake and that it hadn't affected the clutch negatively. It wasn't till after I had made my last post that it occurred to me. Still though, WHAT a difference! My oil was still very clean before adding the sea foam so I'll be interested to see how much crap comes out when I change my oil this weekend. I swear the engine revs faster and smoother too.