Based on what the UOA'S here on the site say, and what all the members state as the oil they use, how many miles they go between changes, it seems clear to me it doesn't matter what brand or weight oil you use, they all do the job just fine. And when you look around and see 20 year old + bikes that run just fine, I have a hard time believing one oil actually works better then another. All the obsessing over what one doesn't shear as much as another, seems to worry the owners more then the bikes motor. My manual says to use an SG rated oil in my motor so I do. Not the most expensive oil there is, but oils that meet that rating. I ride next to guys using Amsoil, mobil 1, and a few other high priced boutique oils and never had any motor problems. How can that be?. Can anyone say with provable logic that using $16 a qt oil will get you any better results in the long run, than using $6 a qt oil?.,,