AdBlue is an additive used in modern diesel cars to reduce harmful emissions, but it must be added only to its designated tank. If you accidentally poured AdBlue into the diesel fuel tank of your Toyota Corolla, it is crucial to act quickly to prevent costly damage.
What is AdBlue and why should it never be mixed with diesel?
AdBlue is a solution composed of urea and deionized water, used in Selective Catalytic Reduction (SCR) systems to reduce nitrogen oxide (NOx) emissions from diesel engines. It is injected into the exhaust system, where it helps convert pollutants into harmless substances.
However, if AdBlue enters the diesel fuel tank of your Toyota Corolla, it will not enhance engine performance—instead, it can cause blockages and serious damage to the fuel system components.
What happens if AdBlue enters the diesel tank of an Toyota Corolla?
❌ Crystallization and clogging of the fuel system – AdBlue does not mix with diesel and, upon contact with certain components, can form crystals that block injectors, fuel lines, and filters.
❌ Corrosion of metal components – AdBlue is a corrosive solution, meaning that over time, it can damage essential parts of the fuel system.
❌ Serious injection system failures – If the engine is started with this contaminated mixture, it could lead to a complete breakdown and require expensive repairs.
What should you do if you put AdBlue in the diesel tank of your Toyota Corolla?
If you realize your mistake, do not start the engine under any circumstances! This is the most important step to prevent the solution from spreading throughout the fuel system.
✅ Stop fueling immediately – If you notice the error while pouring AdBlue, stop immediately and do not turn on the ignition.
✅ Do not start the engine or attempt to drive the car – Starting the engine will circulate the contaminated fuel, worsening the problem.
✅ Seek professional help – Contact a car service that can drain and clean the fuel tank. In some cases, the diesel filter and other affected components may also need replacement.
How can you prevent this mistake in the future?
🔹 Pay attention to the filling ports – The AdBlue tank is usually clearly marked with a blue cap, and its filling neck is smaller than the diesel fuel inlet.
🔹 Double-check before refueling – If you are unsure, read the labels and make sure you are putting the liquid into the correct tank.
🔹 Educate anyone who refuels the car – If someone else fuels your vehicle (professional drivers, company employees, etc.), explain the difference between the two tanks to avoid mistakes.
Accidentally putting AdBlue into the diesel tank is not a minor issue and can lead to severe engine damage if not handled properly. Act quickly, do not start the engine, and seek professional assistance to avoid costly repairs.
Stay vigilant when refueling and take preventive measures to avoid such costly mistakes in the future!