The A6 has a 7 speed S-tronic gearbox. The car has four driving modes- comfort, auto, dynamic and eco. In comfort and eco modes, if you were to floor it, the gear shifts take longer. They should be slower to react to throttle inputs, but the shifts themselves feeling slower, I don't quite understand why. The 40 is the "b-cycle" engine, a variant of the EA888 Gen3 engine that implements a modified Miller cycle, and is built all around being efficient. Audi made a whole document talking about it. Google search "Audi SSP 645". The EA888 Gen3 b-cycle is the "40", the EA888 Gen3 evo is the "45". Keep in mind that MY21 introduced the Gen4 versions Vay Tiền Nhanh Chỉ Cần Cmnd Nợ Xấu.

audi a6 45 tfsi engine