Just bought A3 -juddering
 

I just bought a 2.0 TDI and its great BUT at 50mph in 5th it starts juddering quite a bit, changing to 6th gets rid but then occurs instead at 60mph. 70mph seems mostly fine, slightly there. Perfect under 50mph in 5th and down.

Am so annoyed!

Things I have read so far:

Wheel balance - I believe I has a new set of tyres.
Gearbox
Contamination of fuel

I intend to contact the dealer and ask them to investigate but thought this forum may be able to share insight on this description?

Thanks a lot!

try wheel balance that could be the problem.