U.S. buyers will first see the S-class as the S550 , with a twin-turbo , 4.6-liter , 449-hp V8 under the hood and a seven-speed automatic , in either rear-drive or all-wheel-drive configurations .
美国消费者最早看到的S级轿车会是S550，它配备了最大输出功率为335千瓦的4.6升双涡轮V8发动机，后轮驱动与全时四轮驱动款均配备七速自动变速器。
s550