Hi all.... Since I have a bad rear Bilstien on my '78 300D, I've decided to order a complete set and replace them all at once. The car has 205K on the odometer. Do the springs generally need replacing about now, too? It doesn't sag, but it doesn't have a pronounced rake (like other '123 cars I've seen) either. I guess the question I am trying to ask is: Do those springs ever wear out?