Hello Ch1P.
My GTI is coming up to 3 years old now with 22000 on the clock. Being sad, this year I had the oil/filter changed 6 months after its last service in Oct 22. I know, no comments needed.
The Independent I use {GT101 in Essex; highly recommended} used VW Quantum 5W30 oil.
I also had the Racing Line Magnetic sump plug fitted at the same time.
Have used Shell in my previous vehicles with no issues but to be sure, I have bought the correct one myself and supplied it at point of service in the past.
Enjoy the car buddy.