Take off the oil cap. Look in with a light. If it is light gold in color you are OK. It it is black/brown, be scared. Timing chains are coming out of these when neglected. Also have the service checked to be sure it is up to date.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM