I did a mix of leftovers on a 2013 2.5 Passat in Nov of last year, from which I knew the car was going to be bought back by VW because its a lemon.
Talk about throw out the VW spec out the window... I ran the oil 12,000kms and left it in there when I returned the POS. I really hated this car.
The mix incuded some of each to full sump capacity
Valvoline White bottle 10W30
Motomaster Supreme 5W30
Mobil 1000 5W30
Engine ran ok with it and I never had to top up dispite really beating the [censored] out of it...even through our last cold winter of continuous -30C, started up and ran fine