Mercedes-Benz designed for the common project smart for four and Mitsubishi Colt a 3-cylinder diesel engine of A class of 4-cylinder engine derived from. This module enables high performance and low fuel consumption. The top version with 70 kW is the world's most powerful cylinder passenger car diesel engine.

Mid 2000 Mitsubishi began and smart a joint project to develop a four-seater compact car. Their combined efforts was created so the idea of converting a cylinder class in a three-cylinder diesel engine and install it smart and Mitsubishi small car