Would you please kindly clarify for me as to what one can expect from the latest range of Ford diesel engines? I am currently shopping around for a nearly new Ford Focus or Mondeo car. A local Ford salesman is telling me that the new Ford diesel engines do not rely on frequent long-distance running to stop the diesel particulate filters from carbon build-up. Your advice as to how these new engines perform, and to which year models these engines are fitted, would be most appreciated.