What Happens When You Mix DEF Fluid with Diesel Fuel?

Discover the dangers of putting DEF fluid in a diesel tank and how to mitigate engine damage.

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Putting DEF fluid in a diesel tank can be catastrophic. DEF (Diesel Exhaust Fluid) is primarily water and urea and will contaminate the diesel, leading to severe engine damage. It's crucial to avoid starting the engine and have the tank professionally drained and cleaned immediately. This prevents further complications and expensive repairs.

FAQs & Answers

  1. Can DEF fluid harm my engine? Yes, it can cause significant damage if mixed with diesel fuel.
  2. What should I do if I accidentally add DEF to my diesel tank? Do not start the engine; have the tank drained and cleaned by professionals immediately.
  3. How can I prevent DEF contamination? Always keep DEF and diesel tanks separate and clearly labeled.
  4. What are the symptoms of DEF contamination in diesel fuel? Symptoms include engine misfires, reduced power, and warning lights on the dashboard.

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