My thought is that if the car is not driven in way which is 'sympathetic' to the characteristics of the DPF then it will end up doing some expensive damage, of which high oil consumption could be a side effect. If a full regeneration has not taken place for 18 months then the DPF is likely to be in a bad way.
Take it for a blast up the M4 to give it half a chance & then just see whether there is an improvement. Maybe worth considering a different fuel type such as petrol with LPG conversion if the main purpose of the vehicle is for short trips.
As a side note, keep an eye on the oil consumption especially if the turbo is drawing oil out. Friend of mine has just had a VW TDi engine destroy itself as the turbo sucked all the oil out of the engine and it seized.
Last edited by Simon Jones; May 3rd, 2017 at 13:53.
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