Jubilee in Audi’s mid-sized range: The brand with the Four Rings has been producing the Audi A4 at its main plant in Ingolstadt for 20 years now. With more than six million units sold so far, it is the most successful Audi of all time. The new mid-sized car conquered the world’s markets from the launch of the series in 1994 onwards. And twenty years later, strong demand continues for the Audi A4, now in its fourth generation