Re: Anybody going by the GM Oil Life System?
New 2008 H3 with 1260 miles on it and the OnStar report just said oil was at 82% with a predicted oil dump at 7400 miles.
Working for a Major Transit System, we do oil samples at 4500 miles to see what the oil condition is. Many gasoline engines start seeing more metal in the oil after 5000 miles. The new semi-synthetics have better lubricity through the 7500 mile mark as long as the conditions are not too severe (AKA extreme cold / short trips, extreme heat / long trips, dirtry dusty environment, Marine salty environment)
My higher compression engines really carbon up the oil early so they get changed @3,000-4,000 miles.
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