Putting AdBlue in the diesel tank instead of the AdBlue tank can cause significant damage to the engine and exhaust system. AdBlue is a urea-based fluid that is specifically formulated for use in diesel engines with selective catalytic reduction (SCR) technology to reduce emissions of nitrogen oxides (NOx) in the exhaust gas.
Putting AdBlue in the diesel tank will not provide any benefits to the engine and can cause damage to the fuel system, clogging the fuel filter and causing the engine to stall. It may also cause corrosion and damage to the fuel injectors and other components of the fuel system.
Additionally, running a vehicle on diesel mixed with AdBlue could cause the vehicle to enter a “limp mode” or “reduced power mode” where the engine’s power is limited to protect it from damage, also the vehicle may display a warning message or indicator on the dashboard.
It is important to always use the correct fluid and to follow the manufacturer’s recommendations for refilling and maintenance of the AdBlue system, and make sure to fill the AdBlue into the designated AdBlue tank.