The V8 coupes typically have only a rear hydraulic self-leveling system with conventional front struts, while four-wheel ADS was standard on the 600s and uncommon on the V8s. Accumulators are a periodic maintenance item (owners cite roughly $500 at an indie), and a full hydraulic ADS rebuild with NOS parts can run into the thousands. …
Hydraulic self-leveling (SLS) and ADS suspension
Mercedes-Benz S-Class Coupe / CL (C140) · mechanical