I have 217K on my 97 Contour with a Duratec and ATX. Mine creaks only in the hot weather. Since I live in Las Vegas, needless to say, a good portion of the year. On my car, it is the front control arms of the rear suspension. It is the ones closer to the front of the car. I've tried silicone spray, WD40 and a few other spray lubes to no avail. The only thing that helps a little is PB Blaster. However, that stuff dries out bushings. The creaking noise comes from the center of the car and not on the other end of the control arms. Unfortunately you can't replace the bushings on the arms as they are all one piece. I got a quote of $300 to replace, but I'm sure that I could do better with parts with Bill Jenkins at Team Ford.