Audi 100 three-speed automatic transmission sourced from Volkswagen. The Audi 100 included a rough engine note that was described as unlikely to discourage buyers whose first car had been a Volkswagen and who aspired to drive a diesel powered (pre-turbo) Mercedes-Benz. The Ingolstadt production line was at full capacity, but supply fell short of demand that during the summer of 1970 an additional production line for Audi 100s was set up in Volkswagen's own Wolfsburg plant, which made it the first water-cooled car to be produced in Germany's (and by some criteria the world's) largest car plant. For the Swiss market, the
Audi 50 until 1978, but the cheaper Volkswagen Polo outsold the Audi 50, and Audi discontinued the Audi 50 in 1978, after a total production of 180,812 units. A planned facelift, which would have given the Audi 50 a look closer to that of the Audi 100 and Audi 80 was never implemented, because of a holding company board decision that the Audi brand should concentrate on larger, more expensive cars. The Volkswagen Polo range continued to evolve, with the Volkswagen Derby notchback version, despite being developed by Audi at Ingolstadt, branded as a Volkswagen and launched in 1977. Subsequently, the Volkswagen