The rear springs of my CDI were replaced at 108k miles by PO. Some time ago I noticed that there was a break in both of the springs (this is a known weakness of the W211). But, in both cases, the break is in the bottom-most portion of the spring, perhaps 180 degrees into the first coil from the bottom. As a result, the entire spring is perfectly seated and everything seems perfectly stable.

Is there any pressing need to replace the springs?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife