I purchased an extended coverage for my Lincoln Aviator. One year in to the contract, I kept getting check engine light on, so took the car at a local Lincoln dealership. After the diagnostic was done, it turned out there is low compression on cylinder 6 and 7, which required replacing the left cylinder head (COVERED UNDER MY CONTRACT). The techs at the dealership determined that this happened due to lubrication as there were scars on two of the valves, (American Warranty made me authorize the teardown). After three days of running around and... read full review »