Deutz AG is a German engine manufacturer. The company was founded by Nikolaus Otto, inventor of the four-stroke cycle internal combustion engine, in 1848 as N. A. Otto & Cie. Formerly, Deutz also produced agricultural machines like combine harvesters and tractors as well as commercial vehicles such as lorries and busses. The company is located in Keln and in 2004 was manufacturing liquid and air-cooled diesel engines.
During the second world war, the company was ordered to produce artillery and took on the name "Kluckner Humbolt Deutz AG" although both names have been used ever since, even by the company itself.
Parts and service are abundant in the Netherlands and Germany. In the United States and Canada, Deutz engines are viewed as esoteric and unreliable, with parts expensive and often unavailable.
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