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Since 2018, only SCR exhaust gas treatment systems have been used in Volkswagen models with diesel engines. SCR (selective catalytic reduction) technology significantly reduces nitrogen oxides in the exhaust gas. Volkswagen has now developed the next evolutionary stage of the SCR system – so-called “twin dosing”. Adblue is injected selectively upstream of two SCR catalytic converters which are arranged in series. The system is used in the new Passat 2.0 TDI Evo with 110 kW (150 PS), which already meets the technical requirements of the future Euro 6d emission standard as a result.

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