Going to post this in here rather than making a new thread. Please excuse my ignorance, but can I go to a VW dealership and ask them for the oil and filter to do the change myself? I'm getting mudflaps installed at a shop and they let customers bring their own oil for changes. I'm really glad I looked here because I bought a GLI in April and the owner's manual came with a Castrol Edge Professional slip. It also looks like Castrol Edge Professional is not found in the states. I was going to use the Castrol Edge Extended Performance thinking it is the closest thing to Edge Professional but now it looks like VW switched to Mobil 1?
Absolutely you can, and you'll probably find it isn't any more expensive either. My VW dealer is stocking quarts in VW508 0w20, VW504 0w30 and VW 502 5w40 all in VW/Audi bottles made by Mobil (VW recently switched).
Castrol Edge Professional was the former dealer lube and it not any different than Castrol found at Walmart, other than the dealer stuff did not have the Titanium additive and the Walmart version does.
Which spec do you need? I'm not sure on a GLI. It'll be on a sticker under the hood and in your owners manual. The owners manual is likely to be confusing, but the sticker will clear things up.