Here is my first UOA using Kendall GT-1 full synthetic 10w-30, 2004 Avalanche 5.3L V8, 3K mile interval.
Miles on truck was 22,630 at test, with use of a K&N HP-1007 filter and Napa Gold air cleaner. No make up oil was needed. Some light hauling (dump runs) occurred in this cycle.
Since I am...