Glad I Leased my VW. It is Going back to VW with about 16,000 Miles over 2 years.
Mine seems to idle fine.
Performance is very Fuel quality and oil viscosity dependent.
Shell V-power sold near me is garbage. Never performed well. Actually perfomed terrible.
I've settled on running a blend of Irving and Mobil 87 octane fuels they (usually) keep it running like a banshee.
On OIl, If my 1.4 wants more than the 0W20 HTHS so does this Golf R with even higher specific output.
a 1/2 Litre of M1 0W40 FS fixed mine. Before boosting the viscosity, it would not make power and it was way too noisy.
So why is the HumbleMechanic running Ceretec and other LM snake oils?
And How is the crankcase blow-by handled on these cars? Can you keep it OUT of the intake?
With Positive pressure on the Manifold and a late intake event, you should not have as much reversion.
And a bit viscosity should help at least tiny bit with valve stem oil leakage
I think he needs a Lubricant and Fuel lesson.
Ken - a NOT so humble mechanic