There is a big list. I'll gloss over a few
Valve adjustment, oil change, spark plugs, air filter, p/s service, diff service, transmission serivce, lube door seals, check spare, check battery electrolyte and level, rotate tires, retorque p/s sector bolts, check suspension, check brakes, check driveline...

A bunch of work.

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Benzmac:
Donnie Drummonds
300E
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM