Three-pedal SLKs are the enthusiast-preferred and strongest-selling variants. The R170 moved from a 5-speed (1999-2000) to a 6-speed in 2001; the V6 SLK350 6-speed is singled out as 'the one to own'; and the 2015 SLK250 is cited as the last manual Mercedes sold in the US. …
Manual transmissions: 5-speed, 6-speed, and the last manual MB in the US
Mercedes-Benz SLK / SLC · market