1985 Corvette track car, two seasons of track use on oil.
OUT: Unknown blend of Mobil 1 5w30, 5w30 HM, and Mobil 1 Turbo Diesel Truck 5w40. (And maybe some Mobil 1 0w40, but I can't remember.) Mobil 1 oil filter.
IN: Redline 5w30, Mobil 1 oil filter.
OUT: Unknown blend of Mobil 1 5w30, 5w30 HM, and Mobil 1 Turbo Diesel Truck 5w40. (And maybe some Mobil 1 0w40, but I can't remember.) Mobil 1 oil filter.
IN: Redline 5w30, Mobil 1 oil filter.