May want to verify first whether you have air suspension.

If you don't you can assume Mercedes shocks good for 100k miles.

If you do DO NOT replace the hydraulic struts unless they're leaking. NEVER replace them in pairs. They're $800 each.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles