The Audi A4 was the first model in the Volkswagen Group to feature the new 1.8-litre 20v engine with five valves per cylinder, based on the unit Audi Sport had developed for their Supertouring race car.
Audi A4 a fost primul model al Volkswagen Group care să aibă motorul de 1.8 L 20V cu cinci supape pe cilindru, bazat pe modelul pe care Audi Sport îl dezvoltase pentru modelele de competiție Supertouring.