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 100 100s (largely in European style but with tail lights in American style) were also assembled in Changchun. The 1.8 litre engine was known as the "QG18". Hongqi production commenced in 1993 and ended in 2006 where the Toyota Crown Majesta S180 replaced it as its successor under the name HQ3 and HQ430. At the Geneva Motor Show in March 1990 Audi presented its first iteration of the Audi Duo (or Audi 100 Avant Duo) experimental vehicle, a plug-in parallel hybrid based on the Audi 100 Avant quattro. This car had a Siemens electric motor which drove the rear wheels. A