GM’s Opel has announced that it is offering a particle filter (DPF) on all diesel-powered cars it sells in Germany. The move follows the German government’s decision to offer tax subsidies to owners of vehicles equipped with such filters, effective from 1 January 2005.
Earlier this year, Mercedes-Benz became the first manufacturer to make particulate filters standard on its diesel vehicles. (Earlier post.)
In May, Opel had increased the number of models with a DPF as standard to include all 1.9 CDTI Vectra, Signum and new Zafira models.
The Opel DPF is a platinum-impregated catalyzed system, similar to that used by VW/Audi, BMW, and Renault. It operates without additives, and requires no maintenance.
Pressure and temperature sensors in the DPF recognize when capacity is reached. At that point, the engine management system increases the temperature of the exhaust gas via multiple injection, burning the soot particles and restoring the capacity of the filter.