After the start of mass production in April 2003 of a completely new Euro 4, 1.3 L, common rail Diesel engine, an upgraded variant has been recently developed, with power output increased from 70 to 90 PS and torque output increased from 180 to 200 N·m. To meet this target the combustion system has been deeply revised and common rail pressure increased from 1400 to 1600 bar, while maintaining the multiple injection feature already introduced on the 70 PS variant. Moreover, a variable geometry, small turbocharger has been specifically developed and the mechanical components upgraded to comply with an increased peak cylinder pressure from 140 to 160 bar. In order to comply with Euro 4 emission standards on critical applications with high load factors new control functions have been developed, in order to reduce the dispersion and the drift in durability, such as the lambda control based on an O2 sensor. In spite of Euro 4 emission compliance on most of the forecasted applications with conventional DOC after-treatment, a DPF version will be provided as well, adopting the maintenance free technology already applied on other engines with higher displacement. The 1.3 L SDE family is manufactured in Poland, in a plant located in Bielsko Biala, with an installed production capacity close to 700.000 engines per year.