In 2014, four Audi A6 sedans are benefitting from quattro all-wheel drive. These are true five-seaters: large sedans powered by four-, six- and eight-cylinder gasoline engines that generate 211, 310 and 420 horsepower (the latter for the S6) respectively. This year, the Ingolstadt-based manufacturer is adding a turbodiesel version to the A6 line-up. It’s a 3.0L V6 TDI that delivers 240 horsepower and 428 lbs.-ft. of torque.