The transmission is an important part of the drive train and needs to have its fluid changed periodically for the 2005 it should be done every 24 months, 48,000 or 30,000 miles. In this video I just drain and refill, a more comprehensive change could be achieved by doing a drain and fill, driving for day or two, and then doing a second drain and fill. This will get a better mix of fluid out of the transmission and torque converter.