Over in Europe, Mercedes-Benz has just introduced a version of the diesel powertrain for its buses that passes the EEV emissions standards without having to use either a particulate filter (DPF) or selective catalytic reduction (SCR).
Diesel Particulate Filter
While diesel cars are tremendously popular in Europe, they're not without their drawbacks, especially if they're no as clean as possible. German diesel car drivers, for example, face the threat of an additional road tax of €1.2 per 0.1 liter of engine displacement if their car doesn't have an diesel particulate filter (DPF). Additionally, certain cities, such as Berlin and Hannover are going to ban diesel vehicles without DPFs from city centers. Buying a new car that has a DPF is not a viab
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