The Most Important Thing to Know
- Freezing does NOT damage DEF, as long as it is high-quality like Noxguard. The freeze–thaw process does not affect its quality or performance, as long as it happens naturally.
- DEF, or urea solution, is made up of 32.5% high-purity urea and 67.5% deionized water. This chemical balance allows it to work properly in the SCR system, reducing harmful emissions in diesel engines.
What to Do
- Store DEF in a closed, dry place protected from the elements.
- Store DEF above 12°F and below 86°F to preserve its purity.
- Use airtight containers and avoid direct sunlight or heat sources.
- If DEF freezes, do not throw it away; once it thaws, it retains its original properties.
- Always make sure you’re using DEF certified under ISO 22241, ideal for diesel fleets.
What Not to Do
- Avoid direct exposure to extreme cold: Don’t leave it outside, on a balcony, or in a truck bed during very cold days.
- Do not fill the vehicle’s DEF tank to the top: If you won’t be using the vehicle for a while (like during December holidays) and temperatures will drop, leave the DEF tank halfway full. This allows expansion when freezing without putting pressure on the tank.
- Do not mix DEF with water or any other liquid.
- Do not store it in metal containers or in containers that are not properly cleaned.
- Do not use DEF that has been left open for long periods without a cap.
What If I Stop Using My Vehicle During the December Holidays? Can DEF Go Bad?
No — the DEF in your vehicle’s tank will not go bad or get damaged if it sits there for a few weeks.
However, there are important factors to consider regarding DEF’s shelf life:
- Product shelf life: DEF typically lasts 12 to 24 months from its manufacturing date when stored correctly. This date is usually printed on the container.
- Storage conditions: Extreme Heat: Constant high temperatures above 86°F are its worst enemy. Heat accelerates the breakdown of DEF (Automotive Urea).
- Contamination: It’s crucial to avoid dirt, dust, water, or any other liquid from entering the tank or container.
- Direct sunlight: UV rays degrade DEF.
Conclusion
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