The 2003 Mercedes-Benz S-Class is available as a 4-door, 5-seat sedan. Starting at $72,600, the 2003 Mercedes-Benz S-Class RWD is powered by a 4.3L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway. The top of the line 2003 Mercedes-Benz S-Class AWD, priced at $75,500, is powered by a 4.3L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.