What happens at very low temperatures?
The engine coolant warms DEF/AdBlue inside the tank, which is designed not to be affected by freezing temperatures. At particularly low temperatures, if DEF/AdBlue reaches its freezing point of -11°C (12°F), the engine can normally work while the SCR system is de-icing, and there is no adverse impact on the engine. Moreover, the quality and functionality of AdBlue also remains unaffected by continual freezing and thawing.
