The R129s are still depreciating somewhat, but are starting to stabilize, like the R107s.

With the mileage getting piled on nowadays, mid $20Ks is what I am seeing for the nicer, defect-free examples.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car