I just booked my A3 in for its 2nd variable service and was told by the service desk that at 40k the DSG oil and filter will need changing in order to keep the warranty valid, the car currently has 33k on the clock and they want £150+Vat to carry out the work.

Firstly is it true about the warranty?
and secondly is £150+Vat about right or can it be done cheaper elsewhere.

I understand if something was to fail with the DSG system then I may as well re mortgage the house