The SL is the top luxury GT convertible from Mercedes-Benz. With a lineage that dates back to the SSK and SSKL of the 1930's, the SL is the benchmark in this segment. With power to spare, the retractable hardtop SL convertible is all about indulgence. Engine choices include a 382-bhp 5.0L V-8, 510-bhp 5.5L twin-turbo V-12 or supercharged V-8, and a mind-boggling 604-bhp twin-turbo 6.0L V-12. Only 5-speed or 7-speed (SL550) automatic transmissions are available. The AMG models (SL55 AMG, SL65 AMG) offer straight-line performance that can only be exploited on a racetrack or the autobahn. Various available "designo" packages combine interior and exterior trim in a color coordinated theme.