The 2018 Audi S6 is the performance variant of the A6 midsize luxury sedan slotting above the smaller S4 and below the larger S8. All-wheel drive comes standard on all S6 models. S6 Premium Plus ...

But if you zoom out the proverbial telescope, you'll find that the six-cylinder engine goes far deeper than the "lesser trim.

Two titans of German engineering go head-to-head: a 1000HP Audi RS6 Avant C8 takes on the BMW M5 F90 Competition in a brutal ...