Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: Oil sludge
Run a good quality oil and filter and change more frequently. We've said that doing a flush can frequently cause more problems than the dirt you're trying to remove. Additives are more designed for a maintained engine to keep it maintained, but as Logan said, today's quality oils make it moot to use an additive. If neglect has caused a poor condition in your engine, the correct answer is to pull the head and oil pan and clean it out.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?