I've complied a list of VW approved oils that are sold in Australia to the best of my knowledge (see sticky in the Mk6 Golf forum).
There are numerous VW standards for oil, with "504.00/507.00" being the latest standard to date. The brand wouldn't matter too much, since any oil that has been approved by VW would be made to the same standard, so I'd just get the cheapest out of the lot. Or if you wish to support a local manufacturer, buy Penrite Enviro+ 5W-30.
As for what's popular, well, I suspect most owners don't bother to buy or supply their own oil and probably use whatever the dealer uses.
Bookmarks