The quality of the benz springs makes this an infrequent occurance. I have had one broken spring, it was in a 115 240d so it is impossible to know how many miles with the 99000 speedo. When we went through the motor though everything was worn out. (usually that is not the case).
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.
[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.