Different types of Mercedes-Benz diesel engines include the 2.6-liter engine that the automaker introduced in its 260 D automobile in 1936, the in-line five-cylinder OM 617 engine introduced in 1974, the direct-injection V6 diesel engine introduced in December 2004, and the BlueTEC clean diesel alternative fuel engines. In 2005, Mercedes-Benz introduced its BlueTEC technology for commercial use, and in 2006, it introduced BlueTEC for passenger vehicles. BlueTEC vehicles can use ultra-low-sulfur fuels and B5 biodiesel.
The 1936 260 D was the world's first diesel production automobile, and the Mercedes-Benz 2.6-liter four-cylinder engine was its power source. A Bosch injection pump delivered fuel quickly, enabling drivers to reach high speeds. With an engine compression ratio of 20.5:1, the unit produced 45 horsepower at 3,200 revolutions per minute.
The OM 617 in-line five-cylinder diesel produced 80 horsepower at 2,400 revolutions per minute and reached a top speed of about 91 miles per hour. Mercedes-Benz replaced its in-line five- and six-cylinder engines with the V6 diesel engine in spring 2005 and used its C-Class vehicles to introduce the new power unit. The compression-ignition engine features cast-in gray-iron cylinder liners in an aluminum crankcase, and delivers 224 horsepower in C-Class four-wheel drive vehicles.
The Mercedes-Benz BlueTEC clean diesel vehicles use technology such as variable-vane turbocharging and high-pressure fuel injection for powerful yet efficient combustion. The diesel engine's AdBlue system reduces fuel emissions by breaking down nitrogen oxide into oxygen and nitrogen, meeting air quality standards in the United States and abroad.