Mercedes-Benz has taken another first and mandatory step towards BSVI compliance. The carmaker has now introduced AdBlue in its official range of after-sales service products. Diesel engines that comply with BSVI emission norms are equipped with a selective catalytic converter (SCR) which is filled with AdBlue, a liquid solution that converts harmful NOx (nitrogen oxide), which is a major source of atmospheric pollution, from the exhaust into nitrogen and water. If the car runs out of the liquid, it will fail to fire up when you turn the ignition. Mercedes-Benz says that all its cars equipped with SCR will raise a warning, similar to the low fuel warning, when it runs out of AdBlue. However, topping AdBlue is simple and doesn’t require professional help.