What you may find is, as the engine has aged the injectors get worn, the dpf masks the issue, remove dpf and you could have smoke issues, not black as in badly tuned, but white/grey from unburnt fuel.
Six injectors are 1500 quid.
I assume you have googled 3.0 tdv6/sdv6 crank issues?
Logical conclusion.. answer is zero
I think that is a wise move.
I may have said it above, but I am to lazy to look! well worth cutting the oil change intervals in half, if not less.
Look at the price of decent 3.0 v6 engines and you will see what i mean, with labour it will ge more than 50 percent of the value of an early D4.
