Company Audi Reveals S6 Sedan, S6 Avant, S7 Sportback With 3.0 TDI Engine April 11th, 2019 0 The United States has the 2.9-liter twin-turbo V6, but over in Europe, Audi is much obliged to offer the S6 and S7 the 3.0 TDI. Assisted by an...