Originally Posted By: mobilaltima
4.8 vortec, 41,000 miles, typically driven a minimum of 50 miles one way 100 mile round trip, back and forth to college ( friends truck)oil gets to operating temp 5 days a week. would Mobil 1 Extended Performance 10w30 and a mobil EP filter be good for down to 20% on the OLM without a used oil analysis?
We run a fleet of GM V8's.
The recipe for virtually unlimited engine life is simple. Buy whatever cheap synthetic is on sale, get a decent filter, and follow the OLM. I have had some trucks go 14k miles and others trip it at 4400 depending on the duty cycle. Engine life is almost always 250k miles minimum, with a 400k mile 6.0 liter still working every day!
With the V8 engines the OLM is calibrated very well and can save you a lot of money over the lifetime of the truck.