BMW M550i

2020 Audi S6 Arrives in the US to Challenge the BMW M550i xDrive

Audi S6 TDI Sedan 1 of 20 830x553

2020 Audi S6 is here to take on the BMW M550i

For awhile, the only real threat to the BMW M550i was the Mercedes-AMG E43. Those two were the best semi-hot luxury sedans in the segment. Neither car had to really worry about the Audi S6,…