7.0+ liters every time. I open the fill cap and pull the filter before draining the sump. I let it drain for over 30 minutes or close to an hour if I'm in no rush.

6.5 liters in, let it warm up a little, drive around the block and then check. Usually it's 1/2 to 3/4 on the dipstick. I add the rest of the liter bottle and then drive it. Check again and 90% of the time I need to add another 0.5 liter.

To check the dipstick, I use the same method I use for my E39 M5 because I know no better. Maybe that's wrong.

The Mobil 1 ESP 5W30 comes in liter bottles.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim