I would stick with the TXT, it is a very good oil and meets the BMW LL01 spec.....CG however does not...SLX AKA GC has the following spec, and it was formulated specifically for VW.....
ACEA A3/B3/B4
API SL/CF
MB 229.3, 229.5
GM-LL-A-025, GM-LL-B-025
VW 502 00/503 01/505 00
I would be...