Royal Purple is among the most available to me. As I stated in another thread I currently run M1. I ran RP for a little while but I experience some peculiar looking tiny metal flakes that simply are not found in any of the oils I've run when drained. A local speed shop is whom pointed it out to me and informed me that is a trait of royal purple and therefore they do not particularly care for it. I've noticed I do not have the flakes with Mobil 1 full synthetic, or Redline. I haven't tried Amsoil. I'd switch back to Royal Purple due to it's availability if someone could give a logical explaination.
Thanks
Thanks