Outside the box thinking....
Or just connecting some dots incorrectly, but:
I just read through this thread after checking out a thread on another D5 with a smoky exhaust. I'm wondering if the DPF in Euro 4 and later engines can be masking so some degree another problem - perhaps excessive smoking from a ruptured Intercooler, or IC piping, or some other breathing problem. I guess also a faulty or out of spec MAF for example could also cause poor combustion and excess soot.
Just a thought.
Andy
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