The basic advantage of SCR technology is the reduction of of emissions of Oxides of Nitrogen NOx at 90% while at the same time it decreases the pollutants of Hydrocarbons HC and Monoxide of coil Coat 50-90% as well as PM at 30-50%.

Furthermore, Selective Reduction System (SCR) presents additional advantages .It requires minimum and low maintenance cost; it does not influence the rest vehicle's parts and the service periods. Last but not least, the the SCR system is less sensitive in low quality diesel fuel than the other methods which are proposed in order to fulfill the euro 4 & 5 directives.

Also the manufacturers managed to increase the engines' efficiency of the vehicles that use the SCR system in that way so they have around 5% fuel economy.