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,
Preston Car Company plant (later as Kanmet Limited foundry) until 1991. A fire destroyed the foundry, and the site became a vacant brownfield. Part of the old industrial site was redeveloped as Legion Park, and the remainder will become a residential development known as Preston Meadows. Cars manufactured by the Preston Car Company are on display at the Halton County Radial Railway and Saskatchewan Railway Museum, and one is in service on the Nelson Electric Tramway. The Edmonton Radial Railway Society has four Prestons in its collection: one "Prairie" Preston (ex-Edmonton #31) and three "Big" Prestons (ex-Edmonton #53, 65 and 73). The ERRS