Automatic oil sprays out at the measuring rod

Hello talker, I have a problem with the automatic: Everything works perfectly when driving, no oil loss, switches normally. As soon as you turn off the engine, the automatic oil pushes out the measuring rod. If you don’t have the measuring rod in it, there is a 10-20cm fountain. Where does the pressure come from? Where does the oil usually go when you stop the engine? Is there a valve? This is an Audi Coupe (81 B2) from 1986, old angular shape, 4cylinder engine. My workshop, which specialises in 80’s Audis, is stunned. Thinks about buying a rusty Audi 80 / 90 with automatic to install the gearbox from it. But where do you take it from. The engine was given with the automatic until 1988 he means. Who has an idea what you can do? Thanks for your tips!