If we consider the amount of AdBlue® required in the SCR system, it depends on the needs we want to meet. In this way, the additive must be 3-4% of the fuel to comply with the requirements of the current legislation known as Euro4; For the Euro5 requirement, it should be 5-7%. In commercial vehicles, approximately 1.4 liters of AdBlue® is consumed per 100 km.
If the AdBlue® tank becomes empty, this will cause the permissible emission levels to be exceeded and the catalyst will soon be damaged. The results are stored in the OBD system (On Board Diagnostic) and checked periodically.