I have had this problem for over 2 years now on my 59 reg 2.0 TDCi automatic. I too use it for my Chauffeuring business and have now clocked 226,000 miles, so I know how you are feeling. My problem is due to the DPF.......take that away and I have had no trouble whatsoever with this car....It runs like a dream. On 3 occasions, roughly about 80,000 miles apart, the car starts to run rough,engine compartment gets really hot and the constant smell of burning rubber. The car has gone into constant regen mode and the oil level soon rises up the dipstick. On all these 3 occasions, it was down to the DPF pressure sensor. Change that and everything goes back to normal. I am still on the original filter and it is meant to only last 75,000 miles. On the last occasion (last month), I needed to keep driving the car whilst I was waiting to get it into Fords as I had a full diary, so I only filled the oil to half way up the dipstick and then checked the oil level twice a day. It reached just above the max mark after about 2 days, so I changed the oil, filling to half way and kept doing that for 6 days. As you can imagine, my fuel consumption was poor and it cost me about