Practice question

What is the primary function of AdBlue (aqueous urea solution / Diesel Exhaust Fluid) in modern Euro 6 heavy diesel engines?

  1. It is mixed directly into the diesel fuel tank to increase engine horsepower
  2. It lubricates the transmission gears
  3. It is injected into the Selective Catalytic Reduction (SCR) exhaust system to chemically convert toxic nitrogen oxides (NOx) into harmless nitrogen and water vapor
  4. It acts as windshield washer fluid during sub-zero temperatures

Answer: C — It is injected into the Selective Catalytic Reduction (SCR) exhaust system to chemically convert toxic nitrogen oxides (NOx) into harmless nitrogen and water vapor

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