Sadly, the blue stuff is OEM only; ask for it by name at your VW parts
counter: ZVW 237 105.  $18.95 each at Boston Volkswagen, for example.

Without kicking off a religious war, suffice to say that there are divergent
opinions on the wisdom and utility of paying that much cash for antifreeze --
some knowledgeable folks would say to use any "aluminum safe" antifreeze and
change it once a year, not every two as the owner's manual recommends.

Best,
d.
1990 GL -- "Mudskipper"