How long does DEF last?

I’ve had some diesel stored in a container for a few months, but I’m not sure if it’s still good. How long does DEF last?

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Answer provided by
Melanie Mergen
Answered on May 04, 2022
It’s important to consider diesel quality before adding it to a vehicle! DEF, or diesel exhaust fluid, has a general shelf life of about a year. Exposure to heat and sunlight can degrade DEF quality, so it’s important to store it in a cool, dry place in an appropriate container.
Using expired or degraded diesel can cause vehicle damage and performance issues, so if you suspect your DEF might be expired, you may want to avoid using it.
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