With engaging driving dynamics and a handsome interior, the A6 is a favorite of ours. Its base engine is a 252-hp 2.0-liter turbo four with front-wheel drive and a seven-speed automatic; all-wheel drive with an eight-speed is optional. A supercharged 333-hp 3.0-liter V-6 is available with all-wheel drive and an eight-speed. The A6 does almost everything well, whether carving up corners or highway cruising. 2015 and 2016 diesels have been stop-saled until further notice due to EPA violations.