I unfortunaley didnt do it personally. I have a good friend that runs a shop here in STL and I purchased 14 quarts based on what he told me his machine required. I know if you just drain the fluid and not the converter its only 7.4 quarts. I check the fluids weekly because of the mileage I drive and it is perfect everytime in the last 5000 since the change. I'm clueless...