As a fairly new owner of a 2008 1.8 Tdci C-Max, my main complaint is the apparent loss of power at low revs, which is really only noticeable in 2nd gear - quite a big impact on drive-ability. It's a shame because when the engine wakes up it is quite a joy.
The main problem is that I do a lot of very short journeys during the week as I drop my child off at the child-minder 5 days a week - this is only about 1 mile tops. This is probably not great for any engine really.
I guess this is worsened by the dreaded DPF and maybe EGR (they both seem to be a pain in the butt).
What I can do is take the car for a decent spin at least once or twice in the week and on the weekend. So what I would like to know if anyone knows anything about anything(!) - what would be the best thing to do, to keep the engine in decent condition given that I have to make 10 1 mile journeys during the week?