Attached are 2 x PDF files generated from the BMW TIS on headlights, as mentioned before, if your going to change either the horizontal or vertical aim, be very aware that you may blind oncoming traffic if you aim your lights as to what you perceive to be adequate to what you require and not what the road regulations dictate. Nothing ****es me off more than being blinded by oncoming traffic with badly adjusted headlights. You would be far better taking the car to either a dealership or indy garage with the correct equipment and have the lights correctly aimed. Once that is done, take the car home, drive it onto a level surface and perpendicular to a wall at 5meters, turn the lights on to low beam and mark the wall where each light beam hits the wall. Take measurements and mark a centre line and the exact location of your car so should you wish to recheck at a later date, you can duplicate all the required parameters.