Its interesting that on all my oil changes covered by the dealer, they say they put in 7 quarts on my '13 X3 28xi. After I went for a drive from the 'max' reading, it then showed I was probably 3/4 of the way full.
When you look at this site, it says 6.1 quarts.
http://www.automobile-catalog.com/auta_details1.php