Hello together, with my ML 420 CDI W164 OM629 a leaky oil cooler was found. I would like to perform the repair independently. I have already informed myself extensively how extensive the repair is. In my opinion it is less expensive than with the 320CDI, since the turbo does not have to be removed :-). In this connection I would like to immediately the suction bridge, the suction tube valves, the AGR cooler, the AGR valves and all that I still get to disassemble and clean. Has anyone already made it independent? The following questions occurred in advance: – Which seals can/should be replaced on occasion? – Are there situations that will be used by a special tool? (Mercedes-specific, special screws, or inaccessible screws) – With what torque should the screws be tightened afterwards? – What must be taken into consideration during the dismantling/coupling? – Must the fuel system be ventilated before the first engine start? I would be pleased with any information.