when i first got my car, one of my first experiments was running regular 10W30 Valvoline in it. after about 100 miles, it was cooked from the turbo.
i switched to the same Mobil 1 that i was running in my Nova- and it looked brand new after a few thousand miles.
but these days i just run one of the diesel oils- sometimes i run the synthetic Rotella T, but i think i've just got NAPA regular 15W40 diesel oil in it. if it didn't leak from the rear and front seals, oil pan gasket, and valve covers, i think i'd go back to the Mobil 1 since it ran the best on that oil.