Hi. I just took my 03 Aviator in for a few issues. First, a rear window stopped functioning. Second, the liftgate button, to open the liftgate stopped working, third, the body moulding under the liftgate window had a vertical crack in it, and there was weather molding falling off on the right, passenger side of the vehicle. I also got an ABS light as well. All of this got me to the dealer quickly. All is still under warranty and service, as usual, was great at my local dealer. However, when I asked why these little things were happening, the service manager said that unfortunately, the car is getting into a mileage bracket (42K miles)when these types of things happen. He also said that everything that had happened to me was common on Aviators. He then said I should seriously consider the Ford PowerTrain extended warranty. He said that the Aviators were known to have valve problems at around 50K miles and that job alone was 3800 dollars. I guess my question is in two parts: First, if I plan on keeping the car, is the extended warranty a good idea (quoted 2100 dollars for three years, 85K miles) and does anyone know or can anyone confirm that indeed Aviators have valve problems around the 50K mile mark?