BMW folks said today its a 24mm and its located at bottom of engine down from the oil pan drain plug WHICH come to find out, has been stripped. I sprayed some penetrating fluid on it, and tapped with a hammer-no dice.Will try to go up from a 8mm to a 9mm, try to tap it and and break it loose.Barring this, any suggestions?
BTW- this site is terrific-thanx for all the feedback! Begins to eliminate those exorbitant BMW repair costs!