For the benefit of those who have never seen an original equipment trap oxidizer on the OM 603 ( in this case on a 124 wagon) here's a shot of one still on car that is for sale on EBay (it's the coffee can sized container with the tapered ends just to the left - passenger's side- of the cam cover.

If this car had ever been to the dealer within the last ten years the trap would be gone. Too bad, looks like a decent car but with the trap still on it you've got to be worried about the (low) level of maintenance.

Trap photo (go to the engine photo if this doesn't take you there directly)

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold