0w20 in n/a (non turbo) for better economy and better start up (especially in cold) protection. also as stated before more power due to less friction and parasitic loss.
vs 5w30 in turbo due to increased heat, increased protection against breakdown. parasitic loss can be overcome due to the snail attached to the exhaust system.
after tracking the trek in ambient temps above 80F and seeing it reach 277F I'm thinking if I ever track it again I will be switching in 5w30 for better protection.
more concerning is when traveling to the mountains in below 40F the oil temp reached 240F. my Corolla (4age) and is300 (2jzge) never saw 250F in any driving situation--uphill or track.
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