Jaso... a snake oil scam???... I beg to disagree. The Jaso grading system measures an oils ability to resist clutch friction (or slippage). It also measures protection offered against engine wear and pitting in the gear box. I look for the Jaso, Jaso MA, Jaso Ma1 and Jaso Ma2 specs on motorcycle oils because without them, your clutch is at risk. I know of one friend who had to replace his clutch friction discs due to using a non Jaso rated motor oil. He thought he was saving some moola using straight motor oil. The clutch friction discs looked like knew, but slipped horribly. Just replaced the friction discs and good to go. He is now using Jaso rated oil. If it's not Jaso rated, I don't use it.
