Hi there...newbie here seeking advice. I'm quite keen on buying a C5 - I think it is the car that I want, that will fulfil my needs. However, having read various posts on this forum I am a little concerned about buying a used C5 that is going to land me a big bill for having the DPF changed. So...to my question......do all diesels have the DPF? If not, which engines don't? Many thanks.