You did not say if you have an external oil cooler... like along the edge of the radiator...
This would account for some amount of oil ....
With this it usually takes about 8 qts...
I am really worried that you have some item which has allowed you to OVERFILL your engine...
Which would be very bad...

For instance.... there are more than one dipstick amoung MB engines...
any chance you have used one from one car in the other...
9 qts of oil is just too much in my opinion... and even more if you do not have an external oil cooler...

better a little low on oil THAN ANY OVER !!!!!!!!!!!!!!!!!