My dealership uses Castrol Syntec 5w40. I think other dealers use other VW 502 approved oils.
Most people use Castrol 5w40 or Mobil 1 0w40, both of which are VW 502 approved.
It's fine to have the dealership change your oil, but you can get it done someplace else, also.
2007 A4 2.0T CVT Cabriolet S-Line Phantom Black
APR 93, K&N air filter, Podi boost gauge, chrome-stripped grille, RS4 RSB
Smoked reflectors & markers, smartTOP, Eibach Pro-Kit, 12F/15R spacers, ER SMIC
Xenon match DRLs, HID fogs, S4 mirrors, red LED interior, CC, 034 HFC + Magnaflow 14829