DieselNet reports that Mercedes-Benz has equipped the S500 with a gasoline particulate filter (GPF), representing the first series production application of the GPF technology.
The installation was confirmed in the Auto-Umweltliste 2014/2015 report published by the Verkehrsclub Deutschland (VCD, German Traffic Club).
European regulations mandate a solid particle number (PN) limit of 6.0×1011/km, numerically equal to the limit already in place for diesel cars, to be effective for gasoline direct injection (GDI) vehicles from September 2017. A relaxed PN limit of 6.0×1012/km becomes effective for GDI vehicles beginning next month.
Gasoline particulate filters utilize the same type of wall-flow substrates that is used in diesel particulate filters. A GPF can be included in the exhaust system in addition to the three-way catalyst (TWC), or a TWC coating can be applied onto the GPF substrate.
VCD estimates that the added cost for the GPF can vary from €20-50 per vehicle, when in mass production.