The Airmatic air suspension is the range's most-discussed wear item, with air struts/bags leaking and sagging typically around 70-90k miles. OEM AMG-specific struts run about $1,500 per pair; Arnott replacement bags and full coilover conversions are popular cheaper alternatives, and some owners argue coils actually ride and handle better by shedding weight.
Airmatic air suspension failure and Arnott / coilover remedies
Mercedes-Benz E55/E63 AMG (W211) · mechanical