Never tried Royal Purple. The people that I know that ran it either have said it was good or that it was complete garbage. I've noticed that some oils run different on different cars, one of them being Royal Purple. I have tried: Mobile 1, ENEOS, Motul, Amsoil, and Amsoil Dominator. Now, Dominator has been the best one that I have tried and it's the only one I will ever use from this point on. Oil consumption is the lowest with Dominator. Dominator is meant for racing, so it will take a beating without even altering in any way, shape, or form.
Becoming platinum gives you the best advantage and that is Amsoil at dealer cost. There a ton of goodies, but this perk is my absolute favorite. That INCLUDES ANYTHING from Amsoil's catalog! I also rune ATF, brake fluid, tranny fluid, rear diff fluid from amsoil. Simply the best! :bigtup: