It is a different Benz, not pre 1995.
Suspension is weak and not designed to be abused. Transmission is life-time oil, but it is killing the transmission and you are looking into 7000 repairs. There are 300 dollars kits to replace transmission oil despite manufacturer recommendation. Radiator is probably due replacement. If it is 4Matic - you MUST put all four tires same patterns and wear.

Power steering may leak. Engine is OK ( harmonic balancer are belongs to E klasse / ML world and not a major issue for C320)
Power steering can leak and require replacement. Water pump is the same. Battery and alternator must give full charge, otherwise error codes will fly in all modes.