OP, you have a European vehicle subforum here where you can get more answers and have numerous info to search.
First of all, does your Audi have GPF, if it does, forget Castrol Edge 0W30. If it does not have GPF, use with confidence (API SL is bcs. phosphorous levels far exceed what API prescribes for SM, SN, SN+, and SP for XW30 oils, but in reality, it is irrelevant for this oil). If you are under warranty I would skip this oil. If not, go ahead unless you have GPF.
If GPF is present, you MUST go VW504.00/507.00 oil. Castrol that you mentioned is not the only one that is approved, literally, dozens of oils are available:
Motul 5W30 X-Clean+
Mobil1 ESP 5W30
Mobil1 ESP 0W30
Pennzoil Platinum LX 0W30
In your local VW dealership, you can also find VW branded (Mobil1 makes it) VW 504.00/507.00 0W30.
My choice would be Motul 5W30 X-Clean+, Mobil1 ESP 5W30. Those two. Mobil1 ESP 5W30 you can find on sale at NAPA sometimes or Mobil1 ESP 0W30.
Do not go Redline Performance if you are under warranty. Redline is more track oil, and short OCI's are desirable. If GPF present, forget Redline 5W30 Performance. You must go Redline Performance Euro.