History of the diesel car featured an aluminium block, DOHC chain driven valvetrain, common rail direct injection and variable geometry turbocharger. In Spring 2005, Mercedes-Benz unveiled their first application of a mass-produced aluminum block diesel engine for passenger vehicles and commercial use. While aluminum is traditionally considered of inferior strength and temperature resistance to withstand diesel applications, Mercedes engineers made extensive use of CAD/CAM design to arrive at an aluminum block that would meet with Mercedes' testing and reliability standards. First use was in 2006 model-year vehicles in the E-Class sedan and ML-class and GL-class SUVs. Similar in weight () to the five-cylinder it replaced,
Iroquois Motor Car Company being "put to work continually." The company was working on putting a four-cylinder, 15-horsepower touring car with direct or chain drive, known as the "Iroquois", into market. They had also begun producing their own automobile bodies. For a few months, there was discussion of Century Motor Vehicle Company merging with J. S. Leggett's, Iroquois Motor Car Company who manufactured the body for Century, however, that did not occur because Century had too many liabilities. By December, 1904, the company raised $450,000 in capital, primarily from one shareholder, Charles A. Fox. The name changed again to the Iroquois Motor Car Company