FACTS ABOUT PEUGEOT ADBLUE DELETE REVEALED

Considering that final diagnostics / code clearing drove three miles and lightweight back again on / motor turned off straight absent ad blue filler cap eliminated and tried to blow/suck via cap to see if ventilated. Cap is not really ventilated. left cap off and tissue in filler neck for 80 miles/no lights came on.No, not all diesel autos use AdBl