So this is after ~2500 miles with 4 track weekends/8 days and about 600 miles on track (2 of those days were wet though, so basically street driving...)
Mobil-1 0W-20 with a JR radiator/oil cooler and stock everything else except for camber mods and brake pads/fluid. The cooler has kept oil temps down - I think 228F has been my max, but it's been cool all 4 weekends so far.
I've learned some since and thought maybe I had messed up running 0W-20, but I don't see anything of real concern here ... ???. Will probably switch to 5W-30 now just to have a bit of insurance, since it's still an approved spec for the car and the 0W-20 seemed to work OK.
