20 mile commute should see the DPF cleaned out regularly
make sure you horse it regularly as well
and worse case you get it removed if it goes ( the internals that it)
Just to add - clearing a DPF ( regen ) requires reasonably steady driving at around 2200 rpm for 15 mins or so.
Horsing it, hoofing it and generally driving it like you stole it won't regen very effectively.
And just to settle your worries - since my office moved 18 months ago I only do 3 miles to work and 3 miles back each day.
At weekends I do longer trips - say 40 miles or so
BUT - the 2.0TDi regens far less than the smaller engines.
and as JBB points out - the dpf can always be removed
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