ok I been reading up on th ebenefits of using a synthetic oil, while i was researching i read about a lawsiut that mobil 1 lost, apparently its not a full synthetic. Im not sure about castrol syntec either. royal purple on the other hand is fully synthetic, and so is lucas racing. but for some reason im not a big fan of royal purple, one its purple oil (why?), second how come car manufacturers never service higher performance cars with royal purple. I know lancer evos require mobil 1. anyway just wondering what you guys know about this.