As above, I have a 1.9cdti 150. Its done a fair few miles, about 134000, and to me, it seems to run OK.
I have read stories on here about swirl valves, EGR's, fuel pumps etc being faulty.
What things should I be checking/cleaning in order to ensure I am getting optimal performance. I have a Caterman box fitted, not sure if that affects anything (clogging up with dirt, straining pumps etc).
I have had the car about a year, and despite the high miles, nothing has gone wrong with the engine (touch wood).