What is DEF Fluid and Its Role in Diesel Fuel Systems?

Learn what DEF fluid does and its role in diesel fuel systems. Understand how it affects your engine performance.

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DEF fluid (Diesel Exhaust Fluid) is not meant to be mixed with diesel fuel. DEF is used in the Selective Catalytic Reduction (SCR) system to reduce harmful emissions from the exhaust of diesel engines. Adding DEF to diesel fuel can severely damage your engine, reduce performance, and result in costly repairs. Always ensure DEF is only added to the DEF tank and not mixed with diesel fuel.

FAQs & Answers

  1. Can DEF be mixed with diesel fuel? No, DEF fluid should never be mixed with diesel fuel. Mixing them can cause severe engine damage.
  2. What happens if you accidentally add DEF to your diesel fuel tank? Adding DEF to the diesel fuel tank can lead to significant engine issues, reduced performance, and expensive repairs.
  3. How does DEF work in diesel engines? DEF works by injecting a fine mist into the exhaust stream, helping to reduce harmful emissions through a process called Selective Catalytic Reduction.
  4. Is DEF fluid harmful to diesel engines? DEF fluid is not harmful when used correctly within the SCR system, but it can damage engines if mixed with diesel fuel.

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