Audi Ireland - Throwback to 1989 at the Frankfurt Motor Show when Audi revealed a car that would mark the start of the TDI era. The Audi 100 had a 2.5TDI engine
Audi TDI Diesel Engines: Honoring 25 Years Of Fuel Efficiency, Lower Emissions
Audi 100 - Wikipedia
Shed of the Week: Audi 100 Avant - PistonHeads UK
Audi 100 (C3)
Curbside Classic: 1990 Audi 100 - A 5000 Under An Assumed Identity - Curbside Classic
1989 Audi 100 TDI specifications, technical data, performance