it's time for a tranny fluid change. going with mobil 1 atf and per ceg will add ford friction modifier. if i add 3 qts of mobil 1(or a little less to compensate for the ford friction modifier), how much ford friction do i add? and whats best if it matters, do i just add the ford friciton after putting in the first quart or 2 of mobil 1 before topping it off/adding 3rd qt. 'til overflow? sorry if sounds stupid, but don't know too much about cars and better to be safe than sorry....