I have NEVER in 8 years of service seen a 103 timing chain that needed to be replaced. What is probably the case though, is the engine could be using some oil...Buy the car and drive it. Monitor the oil level. If it uses oil have the valve job done (13-1700) and save the money on the timing chain. These are good cars if well maintained.

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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