The bottles of oil from BMW, Castrol, Liqui Moly, Shell, etc should be in liters, not quarts. If only 9 quarts were added, you're almost half a liter short. About 9.2 liters is what you add to get it to the top of the fill line if the oil filter housing had the used oil drained from it (I use a turkey baster).
I know EuroTech uses Liqui Moly and they probably have a big drum of it, so it's easy to miss a few tenths of a liter.
Also check out the BMW CCA "Sommer Schnell Driving School @ BIR" which happens in a couple of weeks. It's a great time and I bring spares of pretty much everything if you happen to need it and techs from Motorwerks BMW attend as well to help out with any mechanical issues.
https://www.motorsportreg.com/events...bmw-cca-645427