If you were to only do short trips in a diesel with DPF you would notice at some stage the fuel consumption starts going up as extra diesel is being used to burn off soot in the DPF. If that process doesn't finish it starts all over again the next time you start the car. The car will keep doing that until that process is successfully completed. I had a Nissan Pathfinder with DPF once, when I first had the car it did 11L/100 but towards the end when virtually no longer trips were done it did 16L/100. In fact the excess unburnt diesel that ends up in the sump made the oil level go up noticeably on the dipstick. So do keep an eye on the fuel consumption and if you find it goes up then take it for a longer run. If you're doing that anyway at weekends I don't think you need to worry about it.
Ron

