Originally Posted by 
Gregz
				 
			I understand (but can't recall where I read it) that the new diesel ingenium engines as built into the defender  are a close-coupled design, which means there should be very little dpf issues. 
My diesel is the Ford engine, which is the medium coupled design, but pre ad-blue. It has done 46k km now and never had an issue. I always disable the stop/start when I start the car so as to ensure the car gets time to regen if required - not sure it actually helps though.  I mainly do shorter trips with occasional (maybe once a month) longer trips.   I have noticed a burning smell coming from the car on occasions, which I put down to the DPF burn doing its thing - maybe occurs once every few weeks.
The only thing that I don't like about the diesel is the turbo lag, which is most prominent when coasting to a stop and then trying to accelerate away, e.g. at roundabouts. The mild hybrid engines, I understand, eliminate any lag.  If I was buying now I would buy the P400 for that reason alone. However newer diesel engines are on the way with the mild hybrid, and I think that would be my pick.