Um, RedLine 75w90 *is*
synthetic , and us racers have a religious devotion to the stuff, though honestly I've never seen a comparison that shows one top shelf synth (RedLine, Amsoil, Royal Purple, Mobil1, Neo) better than any other.
Just got done, and the car feels great! I can totally feel the extra HP and my MPG went up too!!!...
Just kidding :2: