My LS4, with 160,000 miles uses about a quart of oil every 3000 miles. Lifters are as quiet as my 2014 Chev SS LS3. It has always had synthetic oil in it--not synthetic blend, but full synthetic. Is there a reason to remove the heads & put new lifters in? If yes, do I get the valves ground while the heads are off? How about valve springs with that many miles? Wher would one stop?
I believe our LS4 Grand Prix's were the first GM car to use DOD. I've not heard horror stories of problems with lifters as some of you are relating, nor have I experienced any DOD-related problems except the shuddering when stopping.
