Firstly if you are doing just 50miles since the last manual clean of the DPF, then why arent you walking, or taking public transport?!
Secondly, ALL Euro 4's with a DPF, of either type i.e. afterburn (in the case of the D5) or AdBlue urea type (VW's and PSA's) ALL require specific driving for the ECU to perform the self clean, ALL of which require cruise conditions, medium to high load and over 2000rpm for the ECU to implement it.
It is quite obvious if you research the difference between Euro 3 and 4 technologies on how it works, and the likely impact on re-sale value a euro 4 car currently has.
As an example 50k mile Euro 3 Pug 308's / 407s etc are worth about £1000 more than a later Euro4 car purely beacause of the dpf replacement cost, which is needed at circa 60k miles.
Tim..
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