If that oil is made by Tetrosyl Ltd, then it would stop the inside of the engine rusting - sorry, just a joke as I've used a lot of Tetrosyl underseal on cars in my time!
I've used Castrol Edge for a 1.4 16v VAG engine in the past, though it has to be said that Castrol have "bought" their way into the minds of VAG car owners by paying to have their brand name on the oil filler cap. I don't think VAG will be making any effort to use only Castrol at their engine plants, they will be using Fuchs ect as usual.
My current engine oil of choice is Mobil 1 ESP 5w-30 - but really any mainstream oil makers product that has the very strict VW ratings relevant to your engine will be okay.