The 2015 Audi S6 represents the fourth generation of Audi's high-performance luxury sedan. It's powered by a 4.0-liter V8 TFSI engine generating 420 horsepower and 406 lb-ft of torque, coupled to a seven-speed S tronic dual-clutch automatic transmission sending power to all four wheels via Audi's renowned Quattro all-wheel drive system. Available in a single well-equipped trim, the S6 features standard amenities such as quad-zone automatic climate control, Audi MMI infotainment system with an 8-inch display, navigation, Bluetooth, and a 14-speaker Bose sound system. Safety equipment includes a rearview camera, parking sensors, blind-spot monitoring and Audi Pre Sense, which readies the vehicle's safety systems if an accident seems imminent. For 2015, the S6 introduced an optional heads-up display and full LED headlights.