Amsoil comparison showing competitors' performance lower? WHAT A SURPRISE! No one here care about how the diesel trucks take it or how vintage honda motorcycles do with it, rotella has been continuously reproducible in quality and sheer prevention in our subarus. If you question it, check NASIOC as well. No one questions amsoil, as they are good as well, if not better....but I'm not paying the price of amsoil for a daily driven subaru that's for sure.