I run Amsoil in my busa great stuff the deal is you need to find a dealer near your house and befriend them or talk to them they can get it cheaper for you i paid 7 dollars a Qt last time instead of 14-15 at the store
also i tried their engine flush stuff just for giggles seemed to clean out some of the crud in my engine i didnt know about. my oil came out darker than it looked before i put it in and the liquid is clear .. so unless i can prove it doesnt work i think i might try it again in but im going to wait 1 oil change in between uses. i will ask my buddy about possibly setting up a deal if people are interested