Welcome to the Club, Mark. The club thrives on experiences, both good and bad. My S type has the 2.7 litre diesel, and I have never had a problem with the DPF, although, doing a lot of short runs the EGR valves have been a bit sticky on a few occasions, cured usually with a blast on the A38 with the Sport Mode Button pressed on. I have also used Wynns Diesel EGR cleaner which works and saves the messy job of taking out the EGR valves and cleaning them manually. There are also other similar products. If you do a long run about once a month at over about 50 mph for 20 minutes after the engine has warmed up you should never have a problem with the DPF. I also gave my car which has only 60k on the clock a Terraclean service which worked wonders with smoothness and mpg, as well as performance. Additionally, I never use supermarket fuel, but usually Shell Vitro which also helps with the mpg. Enjoy your XF! Regards, Peter.