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 80 inline five-cylinder Audi 90 was reintroduced as an upmarket, more luxurious variant of the 80. The 90 differs visually by the full width tail-light panel; headlights which featured additional high-beam lights and a slightly different front grille. The most obvious visual difference between the 80 and 90 are the indicators, which are moved from beside the headlights to the bumpers next to the fog lights, which were standard fitment on the 90. From 1989 to 1991 the 90 also offered the first 20-valve engine from Audi since the turbocharged engine used in the Audi Sport Quattro. This engine produced and