I bought a 2006 Jaguar S Type 2.7-litre diesel back in April while I was between jobs to see me through. Having now returned to work I am wondering whether I should replace the car for a newer model, say a 3.0-litre diesel Jaguar XF at £15,000 plus trade-in, but as the current car is fine and in good condition it seems a waste to trade it in. I have recently had it serviced and replaced the cam belt as it had reached 80,000. I know you say that there are DPF issues with older diesels but I will be doing 15-20,000 miles a year so a diesel is necessary. What would your advice be given that I am happy with the S Type and what should I do to ensure the longevity of the car?