The Audi S8 is a high-performance luxury sedan produced by the German car manufacturer Audi. It is the flagship version of the Audi A8, Audi's full-size luxury sedan. It is powered by a 4.0-liter twin-turbocharged V8 engine, making it one of the most powerful cars in its class. It comes standard with Quattro all-wheel drive and an eight-speed automatic transmission. The S8 also features a luxurious interior, with standard features such as heated leather seats and a panoramic sunroof.