If there is nothing wrong then leave well alone. However instead Make sure you use premium fuel (such as Vpower) and give your car an Italian tune up every few weeks. Now there will be members come along saying premium fuels are a waste of money and you shouldn't thrash a diesel etc etc. An Italian tune up isn't thrashing but rather a good vigorous drive for 30-40 miles or so. It is always advisable immediately before an MOT. My experience comes from driving diesels since 1986 averaging 20k miles a year and had some cars upto 180k miles without any problems or need of a new DPF, and my MOT tester always comments how clean my exhaust is on test day.
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