For my old 2004 VW Passat the owners manual didn't contain the correct details of what oil was to be used, VW sent out updates to the owners manual( German 4 ring binder) to replace pages in same.
Then about 4 years ago, VW sent me another oil update and a sticker to affix in the engine bay to reference the proper oil spec to be used.
I read, I follow, I respect that oils are evolving and the OEM's can change their advice based on owner feedback and warranty claims.