and so you don't clog up the dpf which on some cars have fluid systems along with them and are expensive to replace

and so you don't fuck the injectors as they need thrashing to keep them running good and on a 2l tdci 130ps they are £250 per injector at ford

and if fuel pumps decide to break up you ned to replace the whole lot including injectors.

modern diesel motors really are only for mile munchers imho. you need to see how much money you would actually save (if any) by comparing mpg's but not only that, you need to factor in the extra cost of the car too as modern diesels are a lot more expensive than teir petrol equivilants. then decide if your driving conditions make the injector and pump and dpf issues high risk or not.

with regards to the dmf's. all modern deisels have them and even some petrols. they perform the job they do very well but what people don't realise is that they are a servicable item that does wear out and will need replacing which is why most places replace them aswell when the cluch needs doing. the down side is they can be very expensive especially from main dealers.