Originally Posted By: GMBoy
Originally Posted By: The Critic
PP is fine for the interval recommended by the GM Oil Life System.
Right on Critic. Not sure about the posters 6.0L, but the OLM on my 6.0L (GMC Sierra Denali) always seems to trigger between 5,000-6,500 miles. I use Mobil 1.
+1 All of my former GM V8 OLM's would get to zero by 6500.