I just changed the oil in my 04 Retro, Mobil 1, 4T 10-40, with a NAPA Gold 1356 filter. Book says 3.9 qts. With bike up stright, oil wont even show on the dipstick. Don't want to over fill, so figured I would see where its at on the dipstick when the bike is on the side stand, and just check that way all the time. Anyone else run into this?