Is this indy of yours a BMW specialist?, if not i'd want someone to hook up with the correct software (or the dreaded main dealer) to see exactly whats going on, can't understand why you have no running problems or limp mode kicking in....is it certain that DPF is blocking up or does the EGR need a good clean out?
Indy could try removing DPF and subjecting it to a serious pressure washing with umpteen bar pressure of hot water, from what i've read this can work wonders.
I'm not in the remove it and be damned camp (yet), 1) who knows what the MOT test might involve sooner rather than later, 2) in the event of a serious accident nothing to stop the insurer having the DPF cut open and finding er nothing, what then? 3) from some threads i have been following not all tuners/de-DPFers are having success with the reprogramming leading to further complications.
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BMW 3-Series E90 - 06 3.0 DPF woes new
BMW 3-Series E90 - 06 3.0 DPF woes new