There are heaps of threads in the oils section of this forum on this topic. But, briefly, I use Castrol Edge Sport 5W30. Most dealers use Castrol Longlife III 5W30. Don't use anything but fully synthetic.
If you take a look at the oils section there is a list that has been put up by Maverick of the oils that comply with the official VW standards (and so I'm not leading you astray, Edge Sport complies with the older VW standard, not the newest one, but I have found it a good oil for the price and my dealer has told me it's fine to use withouth voiding warranty).
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