How to change gearbox oil in an Audi 80?

I recently bought a second-hand Audi 80 and want to change the gearbox oil myself. Can someone guide me on the steps and recommended oil type for this car model?

First, locate the oil drain plug at the bottom of the gearbox and remove it using a hex key. Then, drain the old oil into a container and replace it with new gearbox oil of your choice. Make sure to use the recommended oil type for your specific Audi 80 model. Refill until the oil level reaches the maximum mark on the dipstick.