UOA on my 2002 Tahoe with the 5.3L. This is High Performance Lubricants HDEO 10W-30 with a Fram Ultraguard XG9837 filter. It has 274,640 miles with 9,748 miles on this oil and a little over a year since the last change. I didn't change the oil in this one. I'll pull another sample at 15k or 20k miles.