Iv'e recently bought an A4 2.0tdi 170 and after reading various posts on this forum am now fully expecting Injector and DPF problems, so I have a few questions if anyone can enlighten me.

1- Are the injectors prone to failure at random, or around a particular mileage? (mines done around 80k odd and is ex fleet, wondering if the problem is likely to have already occured and been sorted out.

2- Is the pour into the fuel tank injector treatment likely to help things (I'm guessing it can't do any harm.)

3- Am I right in thinking that despite the DPF successfully regenerating it will still eventually become blocked by a build up of soot from the burnt diesel matter, and at this stage can it be sorted by any means or is it replacement or removal only?

Thanks