I will tell you one thing, on my Wife's 2008 Trailblazer, if it gets 2 quarts low, it will throw a code for low oil. In this process, it will somehow kill the oil sensor. You will have to replace it. Took me two times to figure out what was going on. THEN I started researching the valve cover oil baffle problems on these motors. I keep a close check on her oil now.
