Hi,
I bought my 420xd at only 22000km (14000miles). At 30000km got the first revision and the BMW boys checked all the parts of the car, no problems reported. At 33000km the car started to shake, the boys found out that the EGR valve is faulty and that there is a recall so I got a new EGR valve and the coolant changed. at 37000km the car smoked on the highway at around 70mph. Result, EGR radiator got faulty and the intake manifold melted. The car was 1 month out of the warranty but luckily BMW covered all the parts and labor.
Ever since i'm disappointed and I feel that the engine does not have the same shape anymore.
This is how the pain looks:
