Editing Diesel engine (section)

====1990s====
* 1992: 1 July, the [[Euro 1]] emission standard comes into effect.<ref name="Reif_2014_182" />
* 1993: First passenger car diesel engine with four valves per cylinder, the Mercedes-Benz OM 604.<ref name="Merker_2014_179" />
* 1994: Unit injector system by Bosch for lorry diesel engines.<ref name="Reif_2012_271" />
* 1996: First diesel engine with direct injection and four valves per cylinder, used in the [[Opel Vectra]].<ref name="Zhao_2009_8" /><ref name="Tschöke_2018_10" />
* 1996: First radial piston distributor injection pump by Bosch.<ref name="Reif_2012_271" />
* 1997: First mass-produced [[common rail]] diesel engine for a passenger car, the Fiat 1.9 JTD.<ref name="Tschöke_2018_10" /><ref name="Merker_2014_179" />
* 1998: BMW wins the [[24 Hours Nürburgring]] race with a modified [[BMW E36]]. The car, called 320d, is powered by a 2-litre, straight-four diesel engine with direct injection and a helix-controlled distributor injection pump (Bosch VP 44), producing {{convert|180|kW|hp|abbr=on}}. The fuel consumption is 23&nbsp;L/100&nbsp;km, only half the fuel consumption of a similar Otto-powered car.<ref name="Reif_2012_223" />
* 1998: [[Volkswagen]] introduces the [[List of Volkswagen Group diesel engines#EA188|VW EA188 Pumpe-Düse engine]] (1.9 TDI), with Bosch-developed electronically controlled [[unit injector]]s.<ref name="Merker_2014_179" />
* 1999: Daimler-Chrysler presents the first [[common rail]] three-cylinder diesel engine used in a passenger car (the [[Smart City Coupé]]).<ref name="Tschöke_2018_10" />