Originally Posted By: tony1679
Ok, I have read every post in this thread. I can't believe how many things have been overlooked by everyone
. All these posts are about rings/pistons. Nobody has mentioned outlying factors. PCV issues come to mind. There are actually many things that could cause oil consumption. While my SS was not involved in this CR report ('08), it is a great example. AFM (Active Fuel Management a.k.a. Cylinder Deactivation) caused my SS to burn a full quart every 750 miles (while using a synthetic I might add). GM said this was/is "acceptable."
After extensive research, I had AFM disabled. Voila! No more consumption. Not a drop. But average joe would have thought it was rings....
While the CR report is vague, as usual, it does mean that there is some sort of issue. Period. Yes, some of these issues could be pistons/rings. But don't assume. My car would have made the oil burner list. Now, I wouldn't trade it for the world
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Some engines are known for bad rings and or cylinders like Honda VCM II engines the Gen I had terrible PCV issues and it wasn’t just the valve but the valve cover but no ring issues. No one mentioned the overlooked anything, we know these things, the other issues are just too numerous and engine specific to get into.
There are so many factors that its impossible to give every example. There are some engines with bad rings no doubt about it.