I ran the Rotella Syn in my 7.3 Powerstroke and was never thrilled with it. Made lots of noise on start up, BLACK in a matter of days and it seemed to burn a two quarts between changes at 4k. No doubt it worked, but left lots of room for improvement. Switched to the Amsoil full syn and immediately had less noise at start up, burned ZERO oil for the rest of the 30,000 miles I had the truck, picked up 2-3 MPGs and could go well over 5500-6k miles before the oil started changing dark. The rotella was originally designed for Diesels. I think it sucked in my diesel, so i just can't see how it could be a great in my bike. Yes it probably "works" fine, but i'm sure there has to be a better oil for bikes because it was designed for that specific application (ie higher temps, higher RPMs, clutch/transmission use). I have ran all kinds of oil in may different bikes/atvs/cars/trucks and Amsoil as a brand across the board is the one i'm most satisfied with in all applications. Price is not something that I would worry about for the oil in my toys, if the best cost money than so be it. Though may not be worth it to everyone. Run what you want...