I use to use nothing but M1 ATF in Moms truck but last time I used Maxlife due to low funds! I had to top off with a quart of Valvoline plain jane blue bottle Dex III. This is on top of any OEM fluid that is in it. Never had any strange smells. I always measure what comes out and I only put in what comes out. Since I use 1 gallon milk jugs to put waste oil in and used 4-5 quart oil jugs it is not hard for me to measure what I took out. I never go by the book I always go by what I get out when it comes to automatics. This assumes you do not let the thing get low on fluid of course!