Thanks all. I'm guessing AFM oil usage issues. I read in another online forum that the problem is AFM problem is worse with long highway driving - that is 90% of my miles. It never used oil before, any idea why it would let go in the last 3k miles? I imagine this will get fun with the dealership. I'm sure that they will be sure they've never heard of such a problems. Old post from 2011 about AFM oil usage concerns. http://talk.newagtalk.com/forums/thread-view.asp?tid=212383&DisplayType=flat&setCookie=1 | 
2010 Chevy 5.3L low oil pressure
