Attachment 12171ive ALWAYS used car oil in every motorcycle ive had , never had clutch problems on any one of em , 1973 kawi KZ 1000 was the superbike that year , 1976 Susuki GS 750 knocked off kz from the top the super bike mound , 1982 Honda CB 750F supersport also ruling superbike of its time , and now I sit on my little dong , pic is my other ride , almost exactly 4 times as powerful (about 40 HP) as the dong and 10 times the weight and she runs 80 :O , no radiator and 2 1/2 quarts of oil no vacume lines and 1 belt , and this is also basically a motorcycle motor , with detatched tranny , BUT I use the CHEAP CHEAP CHEAP oil , if its old or a copy of old , cheap oil works perfectly well , rust free 1974 imported from Germany I bought from fella that bought it in 1974 for 5500 and made him a 500 profit 40 years later , .... my ex paid 46g's for 2006 mustang (that every year had something not warrantied break increasing the cost to about 55 g's) the day it was paid off it was only worth 5g's .... my brother , the master mechanic working for boeing also uses cheap car oil in his bikes