Cleaning systems are installed in heavy duty trucks, buses and also small vehicles to reduce the amount of exhaust gases (SCR catalyst integrated with a silencer).
AdBlue is a clear liquid with a slight hint of ammonia odor. AdBlue is non-flammable, and with proper use, is not hazardous at all. AdBlue tank is marked with a blue cap.
You may find AdBlue fillers at the following Olerex stations: