My 2001 GTS doesn't burn hardly any at all. When it was new, I followed the Arrow break-in procedures, you know, gradually increasing allowable rpm as the miles click by, and limiting the throttle input. I always used Mobil 1, with a Mobil 1 filter.
At 43,000 miles, when I did the heads and cam, I looked at the wear patterns on the lifters. You could see a discoloration, where the lifter slides up and down in its guide, but that area had no detectable undersize to it. I didn't mic it, but if I did, I don't think it would have shown much wear. It was basically like the metal surface just got smoother from polishing, and that made the color of the surface change.
Strict break-in, full warm-ups, Mobil 1 since birth, that's the way I treat all my cars. No oil burning, even on two other vehicles that I've taken near 190,000 miles.
