Hello, it is a 400 CDI W 463 engine OM 628 from the year 2001. (runtime almost 300,000km) There is massive loss of liquid liquid, it seems that against the ZKD is broken. How many times can the ZK be planned? with me that was already 2 times.. Mercedes-Benz master says that with re-editing there is a risk the ZK will not work any more. He advises me to find a new engine and replace the old one. I am now looking .herewith a question fits also for my G Mo tor aus der Mercedes S Klasse 2003 Mercedes Benz W220 S400 S 400 4.0 CDI Motor OM 628.960 628960 250 HP ? Where can I find a good engine?I would be very happy about a help. Thank you. Antonimode