I have an Avant A4 02 1.9 130 bhp that's been amazing. Got it on 72 k and now on 170 k. Looking to upgrade. Want to stay with diesel, only mechanic friends tell me stay away from 06-09 plates as too many issues. Oil seals, n more go. Remedied on 2010 plate, but that's too dear for me. Anyone got experience with the 2 litres between 06-09? Love to hear your experiences. I could go for the 2005 2litre but adviced to go for ones with bkd at beginning of engine number and not BLB as they wear down valve housing fast. Have not yet found a bkd one. When did buying a car become so tricky! Had audi's for 19 yrs! 

Hi Sarah....welcome to the Forum

It does sound rather complicated, doesn't it !

I will let others answer this post, who have personal experience of these particular engines and models that you have mentioned.

Good luck with your search

Cheers  Trevor