Aftermarket oils are all at least twice as thick at 40 deg C compared to OEM.
Every comment I’ve ever read about said oils is always “Great when warmed up”, which basically means it crap everywhere else.
It’s the same with Hondas, but they just get on with it and put the OEM stuff in. The VAG scene seem to just whine about the price of everything and think VAG have some kind of sinister plot to swindle people. It is what it is and costs what it costs. If MK5 GTI maintenance isn’t affordable, there’s a simple answer for that.