The 2003 Mercedes-Benz SL-Class is available as a 2-door, 2-seat convertible. Starting at $85,990, the 2003 Mercedes-Benz SL-Class SL 500 is powered by a 5.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 22-mpg on the highway. The top of the line 2003Mercedes-BenzSL-ClassSL 55 AMG , priced at $ 113,250 , is powered by a 5.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway.