Good quality or genuine VW group oil (Quantum) 5w-30 C3 fully synthetic.
But if you have a remapped engine and you like the thrash it abit your may want to be getting high end/motorsport quality oil such as Millers NanoDrive 5w-40 as this will give you engine more protection and will give abit more performance due to the less friction and better performing oil.
Mine is running at 380bhp so I use the millers nanodrive.
Quantum oil is around £25-30 and Millers is £45-55