Had a look at the UOA on the LS1 at various mileage intervals. What is it showing? 1. The TBN is falling...what does this mean? How low can it go? 2. Wear metals are going up....what does this mean? How high can they go before it's unsafe? 3. Which number(s) show the point where the oil is breaking down and forming sludge? 4. Which number(s) account for the consumption ie. where's the oil going and what's happening to the left-over oil?