You also asked about the OCI... Just stick with whatever is recommended in your owner's manual. I think that should still be 10k or 12 months, unless VW went to a variable/extended drain for your car. VAG has been conservative on the recommendations in the US, mostly b/c Americans are so brainwahed into 3k/3 month OCI and VAG knows Americans won't believe longer than 10k is possible, but they go well past 10k miles in Europe and all is fine over there. Do a UOA if it makes you feel better, but don't fear the 10k OCI if you're using a 507 certified oil.
I know everyone here has an opinion (and that's what makes BITOG so great), but if it were me I would just buy a oil change kit online from BoraParts or IDParts and use the Pentosin or LiquiMoly (or whatever) they sell in the kits. Super simple and good prices. Given the OCI and how infrequently it needs to be done, it's not hard to plan in advance for purchasing online. I also strongly recommend joining the TDIclub for the wealth of information on that web-site for all things TDI.