What problem I can expect with those V6 3L Diesel Engines?

Do have same problems as BMW L6 Diesel carbon in the intake valves & manifold plus plug DPF

I am looking to by ML350 Blutec or E Class 350 Blutec

 

Thank you very much for very interesting information.
New cars very expensive for me
E350 Blutec * under normal use how long can last? how many km can go?
I done on 190D 2.2 1.480.000.00 Km
Now I have OM605912 in W124 body (E250D Europiean)
Do you know BMW L6 3L diesel & how really is?
Mercedes GLK 2.1L 4cyl how good is?
2016 Jaguar XE is coming to north America gas & diesel reports saying is much better from 3 series BMW - Audi A4 & C Class Mercedes & cheaper

 

I get some rumors Mercedes bringing new Diesel L6 2.9L up to 400HP
Competition to BMW tri-turbo 381HP