Drain and fill suggested at 60 to 100k. pretty easy if you have the knowledge. have to measure and know here the fill plug, drin plus and the side plug to tell if filled to the right amount.
For a drain and fill it is under a gallon. Calls for KIA SP-IV also known as KIA Type-4 M. An alternative is Valvoline MaxLife DEX IV/Merc https://www.valvoline.com/our-products/automatic-transmission-products/maxlife-multi-vehicle-atf