I have a modded WRX with 16G evo III and APS TMIC, etc. with 260 AWHP on dynodynamics.
My choice is 0w-30 German Castrol. If anyone can find me a superior oil for that price with UOA, I'll take it, but there probably is none. My local Subaru club also has a large following of 5w-30 Rotella T...