How do you change auto gearbox oil in Audi a4 b6 2.5 tdi v6?

To change the auto gearbox oil in an Audi A4 B6 2.5 TDI V6, start by warming up the vehicle to ensure the oil is fluid and easier to drain. Lift the car and secure it, then remove the drain plug from the transmission pan and let the old oil drain completely. Replace the drain plug, then remove the fill plug and use a pump to add new Transmission Fluid until it reaches the appropriate level. Finally, replace the fill plug and check for any leaks.