VW issued a TSB for this engine in Oct 2016 specifying owners use specific VW fuel additives in their V6-3.6L engines (engine code 7P6/CGRA). See the Technical bulletin and associated instructions attached. The TSB recommends owners put one can per half a tank of gas so approx one can per 50...

searched the forums for Technical Service Bulletin (TSB) info and all I could find were some old posts, e.g., http://www.clubtouareg.com/forums/f43/old-list-of-tsbs-and-recalls-for-touaregs-no-longer-valid-info-8965.html and http://www.clubtouareg.com/forums/f73/tsb-pdf-files-12140.html...