What engine is in Audi A6 (C7) 3.0 TDI 204HP ? The Audi A6 (C7) 3.0 TDI 204HP has a V 6, Diesel engine with 2967 cm3 / 181.1 cu-in capacity. How many horsepower (hp) does a 2011 Audi A6 (C7) 3.0 TDI 204HP have? VPHRa.