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How to thin waste vegetable oil

Updated February 21, 2017

If you have a diesel car, it is possible to run it on used vegetable oil. Because vegetable oil is really thick, it has to be thinned out so it doesn't damage your car's fuel injection system. The simplest way to reduce the viscosity of the vegetable oil is by mixing it with a lighter fuel such as kerosene.

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  1. Filter out any bits and pieces of food from your used vegetable oil by pouring it through a strainer.

  2. Mix three parts of used vegetable oil with one part kerosene.

  3. Let the mixture stand for a week before using it. Don't mix the kerosene and vegetable oil; letting it sit for a week will allow it to mix properly.

  4. Tip

    Used vegetable oil has been found to work better in cars than new vegetable oil.

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Things You'll Need

  • Kerosene
  • Strainer
  • Waste vegetable oil

About the Author

Michael Jones reported campus news stories for The University of Southern California's student newspaper, "The Daily Trojan," for four years before graduating Summa Cum Laude with a Bachelor of Science in journalism. He has since gone on to write for several publications both in America and abroad and has an idiosyncratic knack for translating the most intricate tasks into layman speak.

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