Ya thats kinda weird. I do all my own changes too, and with 7 quarts and a filter, it falls perfect on the dipstick. The first Time, I used 6, it barely registered on the dip stick. What I would do, is put in six, start it and let it run for a minute, then check the level. If its low then put one more in. I don't understand however, why my truck requires more oil than the other guys does? But mine takes 7 and no less.