Quote:
Originally Posted by ZDan
I've been involved in most of those discussions, I don't need to search. None have suggested to me (certainly haven't "proven conclusively") that 0w20 with an oil cooler was "most ideal".
FWIW my '17 got up to 275F indicated (reportedly this is ~255F sump temp) every single session for 5 years, around 50 or so track days, +80k street miles. The car never needed an oil cooler, but I did run high(ish) 3.7cP HTHS 5w30 Redline oil during track season.
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I cant find the thread/threads but i recall when i initially boosted my 1st gen i was looking into oils and came across quite a few very detailed posts by teams that raced the twins, I recall seeing oil temps vs pressures over a time plot showing 0w-20 retaining the least heat over time which is why it was recommended over a heavier weight oil which retained more heat, all of the oils got too hot seeing pressure drops which is why the general consensus was 0w-20 with an oil cooler. Even on the street after doing some hard a** driving at only 300ish wheel I would see my oil pressure bounce around 3-6 psi at idle and oil coming in around 260f and up. Ive never seen below spec around 11-14ish at idle with the cooler and temps stay around 200f tops, cheap insurance if you ask me especially if you drive the car hard and more or less a no brainer if boosted especially turbo. Heat kills the oil, poor oiling kills the engine as numerous people have come to find out with these cars
