I got the lease for my Chevy back in October 2018. 7 months in and all of a sudden my check engine light comes on, as well as my "service stabilitrack" light. The car started idling really badly, sputtering as if the engine was about to quit. I absolutely baby my car so this came as a shock to me, not to mention I just barely hit 6,000km (3700 miles). Turns out, one of my spark plugs blew. Not the end of the world, and Smith Chevrolet fully covered the cost since it was under my lease warranty. Still, a brand new car shouldn't be going through spark plugs. Makes me wonder if the other complaints about "misfiring" have anything to do with busted spark plugs too...