I had a knocking/tapping with my 2011 Equinox. Made an appt to have it checked. Brought it in and was advised by Chris (service rep) that car had only 2 qts. oil. I have my car regulary serviced by Scott Chev. and was told by Chris that after cylinder hd was removed, found zebra stripes on all cylinders, more on no. 2. Instead of repair Chris said engine would be replaced, car still under warranty. Chris and svc dept handled this problem very efficiently. The engine was ordered the same day(monday) and I had my car Friday of the same week. Very good and efficient quick turnaround time.