My mom's 2003 Malibu is at just over 60,000 miles now and the manual states for normal service that the ATF never needs to be changed, but I don't agree with that and want to change the transmission fluid in it. It says for Severe that it should be done every 50,000 or 60,000, can't remember which. Does anyone know how much ATF I'm going to need to buy? As far as I know, it uses Dexron III. Also, does anyone know if dropping the pan on this car is difficult? If it's too much of a hassle I'll pay a reputable transmission shop to just have it flushed. Thanks a lot.