To be sold in the A8 under the 4.0T badge, the engine produces 420 horsepower and 406 lb-ft of torque. Essentially a de-tuned version of the S8's motor, the 4.0-liter is also the same unit used in S6 and S7. As in those vehicles, in the A8 it will team with an eight-speed automatic that sends power to the ground through Audi's Quattro all-wheel-drive system.
Car and Driver reports that the A8 4.0T will sticker from $81,795 for the short-wheelbase version, while $88,905 will buy a long-wheelbase model. Those prices compare to $73,095 and $79,395 for the normal and extra long 3.0T variants, respectively.
