I took my 2011 Equinox in for a routine oil change and tire rotation. The engine had been running rough but I didn't say anything about it to the Service Rep, Tommy Stack. He called me a couple of hours later to tell me the vehicle was 2 qts low on oil. They discovered it needed new rings and pistons; apparently others models of this age have experienced the same issue. The repair was covered under warranty and I was charged only for the oil change. So glad the problem was discovered during service and not when I might have been travelling cross country. Thank you, Knoepfler Chevrolet!