What happened to the recommendation that was banded around about using Millers oils?
Im not sure a single datapoint could be counted as a 'discover' but good that you have no issues.
I went with your recommendation, stick with the Porsche approved oil, because like you said why change the oil when my engine is clearly not suffering any scoring.
So whereas it might be recommended by specialist who might be getting marketing interest/kickbacks from Millers it is clearly apparent the Mobil One is doing my engine no harm at all.