Is it plausible that fresh ATF is already degenerated after 3 years and 35,000 km so far that the gearbox shows symptoms in the form of pounding transducer bridge and fluctuating speed in partial load? Or do I have to assume that the workshop made a mistake at the time? The car had already covered 150,000 km with the factory filling before the oil change. 3 years after the oil change, the symptoms first appeared and became increasingly clear over time. r Troubleshooting in other places they are now suddenly gone after another oil change.