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50k seems like a lot of mileage for a performance shock. I know it's not the same but you wouldn't expect to run the Ohlins on the Porsche for that long without a rebuild, right?
No, the Ohlins need to be rebuilt at pretty short intervals - I'm due now. But they're very high performance shock/damper units.
The stock Bilsteins on the 996 platform are generally good for 100,000k or so.
The adaptive damper units on my E63 are not that special - and the (non-adaptive) dampers on the C55 were going strong at 100,000 miles.
If I'd swapped to track-spec coil-overs then I'd agree, but I think it's poor for the stock units that (I suspect) are common to the more heavily optioned E-Class estates.
Shocks (or, maybe, shock - currently unclear) fitted to the E63. Asked "is the expected lifespan of these fifty thousand miles?" and got "I can't answer that".