Ok, lets get rid of some smoke and mirrors. It's the FUEL SYSTEM that issues are caused through. This is normally to do with progressively higher combustion pressures that are being used to get diesels through tighter and tighter emissions legislations. EURO 6 being most recent, at which point injection systems are heading towards 6000BAR injection pressure. PD engines (early years up to 05) were ok with lower concentrations, higher spec ones mk5 140pd etc didn't like it so much because of the below.
The Bio-diesel content of it corrodes the rubber components (Seals etc) in the high pressure side especially. Viton is the usual replacement as Nitrile just doesn't cut it. OEM's normally guarantee their fuel system to 10% biodiesel content, and it is the manufacturers choice what they warranty up to which is usually lower. I used to be employed by a tier 1 OEM diesel fuel system supplier hence how I know this.
It does have a different profile chemically, but whilst employed by them I never ONCE heard of it being an issue with the DPF. That's not to say it doesn't mess around with it, but generally it presents as running rough or missing (cold start predominantly due to waxing temp).