I had a new touareg 2.5tdi se for 2 weeks , nice car , dodgy electrics . test drove an X5 4.4i se , decided X5 is more comfortable drive .
have you driven your fathers V10 tdi , I bet that engine is magnificent .
as for the smoke issue , vw says alle ist goed , so wait and see what develops , probably weather or fuel related , probably nothing to be concerned about .