Audi A6 50 TDI Quattro vs. BMW 530d xDrive. N , we don't want to join the omnipresent Diesel hysteria here. Because both the new Audi A6 50 TDI and the BMW 530d have already proven in our own emissions tests that they are not only clinically clean, but also in real traffic. What is remarkable about it: the 5 Series achieved a top value of only
2dIZ.