The models with engine troubles will have the 6-cylinder turbo-diesel engine. This engine's code is the 603. There were many different versions of the 603 produced. Only a few of which were affected by the oil windage tray breaking off and clogging the oil pump with metal debris. However I would stay away from any of these six cyl turbo diesels had chronic cylinder head trouble and/or connecting rod trouble. Models: Early 300D turbo, 300SD, and the 350SDL(W126 and W140).
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[This message has been edited by Benzmac (edited 03-13-99).]