Oil specifications are a bit of a minefield. VW have their own specifications 11 in total I believe. The compliance with VW specs is on the label of all oil manufacturers containers.
I have always checked for compliance with VW 504.00 the standard oil for regular service intervals and VW 507.00 for extended service intervals. These two specifications are listed on the Mobil 1 ESP container so I'm happy to use it (I have no personal interest in Mobil there are lots of other oils that are just as good and meet the VW specifications).
There is VW 508.00/VW 509.00 for the 0W-20 lubricants. If you have time to spare you can do more research on
www.oilspecifications.org.