Hi Chris, I have a similar car to Andy, and what he has said is quite correct. If you don't play by the book and give the 2.7 litre Diesel a good run once a month or so you might get a few DPF problems. The 2.7 diesel fitted to the S Type and the early XF as well as the XJ at the same year was only changed to the new 3.0 litre diesel to meet Euro 5 emissions requirement. Regards, Peter.