[RKDinOKC]

Oil sure makes a Huge difference in my GTS. Pretty much settling on Amsoil. The difference is when doing a lot of hard acceleration like at the autocross. Amsoil is the only oil that keeps the engine temps from rising and the idle oil pressure from dropping from 3 barr to 2 barr. As far as I can tell it is because it resists foaming and aeration.