Drain plug only or did you drop the pan?
Going back to my original post, I got ~3qts when I opened the FILL plug, ~1.5qts when I opened the DRAIN plug, and ~1.5qts when I dropped the pan.
Did you drop the pan, or just drain the through the FILL and DRAIN plugs? If you didn't drop the pan then the amount you were able to refill sounds about right.
2001 330i Orient Blue