The M111 engine family is a straight-4 automobile engine from Mercedes-Benz, produced from 1992 to 2003. Debuted in the 1992 Mercedes-Benz E-Class (W124), this engine family is relatively oversquare and uses 4 valves per cylinder. All engines in the family use a cast iron engine block and aluminum alloy cylinder head.

The C208/A208 Mercedes-Benz CLK-Class was introduced in 1997, and was based on the W202 Mercedes-Benz C-Class launched three years earlier. The C208 coupé was the first generation of the Mercedes-Benz CLK-Class and was subsequently replaced by the C209 CLK-Class in 2002, although the convertible remained in production till March 2003 when replaced by the A209 CLK. In total 233,367 units of the first generation CLK were manufactured in its coupé form, when production ceased in May 2002 and additional 115,161 cabriolets assembled at Karmann plant in Osnabrück.