We Value Your Privacy

We and our partners use technology such as cookies on our site to personalise content and ads, provide social media features, and analyse our traffic. Click below to consent to the use of this technology across the web. You can change your mind and change your consent choices at anytime by returning to this site.

Update Consent
Loading ...

How to Recondition Old Diesel Fuel

Updated April 17, 2017

Whether its on the farm or at your local petrol station, diesel fuel will degrade over time. People often buy more fuel than they need and it ends up in long-term storage. Over time, the diesel fuel will become stale and require reconditioning for safe use. By reconditioning old diesel fuel, money can be saved that would have been spent on new fuel.

Loading ...
  1. Pour fifty gallons of old diesel fuel into the fifty gallon drum.

  2. Measure 88.6gr. of PRD-D or 7938gr. of ether using a graduated cylinder and add it to the fifty gallons of old diesel fuel. To make measurement easier convert to litres. Every oz. converts to 29.57ml. For fifty gallons this is 92.4ml of PRD-D or 8.279 litres of ether. Use either PRD-D or ether to restore the fuel, but do not mix both.

  3. Add the fuel re-conditioner directly to the stored fuel storage if possible. The ether or PRD-D could be added directly to the old diesel fuel itself if you know its relative volume. The ratio is 1588gr. of ether or 17719gr of PRD-D per gallon of old diesel fuel.

  4. Allow the old diesel to sit for a day or two. This is necessary to fully recondition the fuel.

  5. Use the fuel as if it were fresh from the pump.

  6. Tip

    Avoid having to recondition old diesel fuel by adding PRD-D to it before storage. This can prevent the water contamination and biological growth that makes old diesel unusable and also serves to prevent fuel degradation.


    Old diesel fuel can become contaminated with water. If it does, it will need to be filtered before it is used since micro-organisms such as algae and bacteria will have grown. If the fuel is only slightly contaminated with water the PRD-D will be able to neutralise it. Even after reconditioning the diesel may still be unsafe to burn. Use adequate judgment before deciding to use the diesel.

Loading ...

Things You'll Need

  • PRI-D diesel fuel stabiliser and reconditioner
  • Old diesel fuel
  • Fifty gallon drum
  • Ether
  • 500ml and litre graduated cylinders

About the Author

Samuel Sohlden began his freelance writing career in 2007. His work appears on various websites, with articles focusing on science and health. In 2010 he attended the Intel International Science and Engineering Fair in San Jose, Calif. Sohlden is pursuing a Bachelor of Science in microbiology from the University of Cincinnati.

Loading ...