high humidity in the northeast and I'm using the Mobil 1 15W50...car is running great! Temps are staying WELL WITHIN check (Thank You PWR for a radiator that can hold it's own) and I've been driving pretty hard out there with about 17-18 lbs of boost and NO issues...
Even had a couple quick blasts to 155 the other day in 99 degree heat on I495 and the car did'nt even flinch..temp needle,pressure etc. all were stable even after doing that and then idling at an offramp...no problems....
Good Times!
And YES, I know I should'nt be endangering innocent people on public highways but since there were no other vehicles around..I just could'nt resist...I'm sure most of the TT guys know the feeling...