Changed oil this weekend. Bentley states 8 US quarts. I put in 7 and the oil level was at the top of the dip stick. I only drained out 5+ quarts but dip stick prior to change was about half way on dip stick marker. Can one loose that much oil (2-3 quarts) and still have a full reading on the dip stick? Front end of car was on jack stands so i am not sure if the non parallel position had anything to do with it. Your comments please.
325Xi, 04, 73K

Also bently states to change large O ring on filter cannister screw top. I did not get one in the new Mann filter box and there was not one on the old filter. Interesting.