I have had my metallic Dark Gray (almost black) 93 sentra since June of 94 and it had 6,000 miles on it from some old lady. It just reached 100,800 miles last weekend. I have recently noticed that the door doesnt close as easily, and the door goes up slightly when it closes. It appears to be sagging just a half a centimeter or so (probably less). The doors just don't sound like new anymore. lol Has anyone else noticed this or have a remedy?