Every brand caters for the correct vw specs these days. everyone has their preferred brands.
vw themselves used to use castrol quite frequently but when they introduced quantum it changed to fuchs.
funny thing with shell really. Most seats used to have a "seat recommends Shell helix"
sticker on the slam panel but I've never seen shell oil in any of the workshops or on any of the shelves in the parts departments of the many
dealers I've visited. maybe they were given a back hander to put those
stickers on?