Oslo is probably getting within a year Diesel-free zones on the worst polution days, which happens to be winter. And I agree this is not a defeat device, but the emissions are wildly above what is claimed by MB. So my suggestions are either that driving on days with below 10C is not allowed, or that when you buy the car and more than 50% of days are below 10C you pay the car taxes as if the car emitted 40x it's testet amount. That seems only fair...
Cobos
Cobos