WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Different Versions Of Oil Drain Plugs
Courtesy of AUDI OF AMERICA, LLC
I - Bolt for oil filler and drain hole with multi-point socket head
45 Nm
II - Bolt for oil filler and drain hole with hex socket