I know I will probably get some negative feedback for this. That is fine. I just purchased 20 quarts of Maxlife ATF to replace the current fill in my transmission which is about 80% Amsoil ATF. I am going to do a complete flush here at home with the Maxlife ATF, and plan on doing 10k drain and refills with it. My theory is that in the long run it will be more cost effective, as I don't plan on purchasing Amsoil for my vehicle anymore. My plan is to run Maxlife products in the transmission and the engine as long as everything shifts nice with it, it will be in the transmission for the rest of the cars life. With 10k drain in refills in my Nissan Altima 2.5, I think it will work out okay.