How do you change transmission oil for BMW 530I 2004?

To change the transmission oil in a 2004 BMW 530i, start by lifting the car securely and placing a drain pan under the transmission pan. Remove the transmission pan bolts and carefully detach the pan to drain the old oil. Replace the filter if applicable, clean the pan, and install a new gasket before reattaching it. Finally, refill the transmission with new oil through the dipstick tube, ensuring you use the correct type and amount specified in the owner's manual.