ok so royal purple is out of the question now. i used straight synthetic before and for some odd reason my oil light would come on for like ten seconds at a time from time to time. it was kinda odd, since then ive been using a synthetic blend 10/40 i beleive and hadnt had any problems.

i have been using yamalube everytime, but seriously if theres no difference in motorcycle oil and car oil then why am i spending ten bucks a quart? i honestly think motorcycle companies are just stickin thier name on some regular oil and uppin the price. if so is this amsol cheaper? is it car oil as well?