Keeping this blend stable is essential for both your vehicle’s performance and environmental compliance.Īs the summer sun beats down, the DEF in your vehicle or storage container might not be feeling so cool. This combination helps in minimizing harmful nitrogen oxide emissions from diesel engines. It’s a mix of 32.5% urea and 67.5% deionized water. You might not be aware of how seasonal temperature changes can impact your DEF’s quality.įirst off, let’s get to know what’s in your DEF. Read related article: Is It Cheaper to Get DEF at the Pump? (3 Best Advantages) Seasonal Temperature Spikes Can Effect DEF However, ensure your vehicle’s DEF system can handle and thaw the frozen fluid. If your DEF freezes, you can thaw and use it without any loss in its effectiveness. If you suspect your DEF has been compromised by heat or any other factor, it’s a good idea to replace it with a new batch to ensure your vehicle’s SCR system operates correctly.Īlso, remember that while heat can be problematic for DEF, freezing temperatures can affect it too. So, when you’re storing your DEF, try to keep it in a cool, dry place away from direct sunlight. Instead of lasting years, your DEF might only remain effective for a few months or even weeks. Reduced Shelf Life: While DEF generally has a shelf life of up to two years when stored correctly, exposure to high temperatures can reduce this lifespan significantly.If these crystals get into the SCR system of your vehicle, they might clog it and cause malfunctions. Crystallization or “Salting Out”: When DEF gets hot, the urea can crystallize and settle at the bottom.Replacing this catalyst can be quite expensive. This not only renders your DEF ineffective but can also damage the SCR catalyst in your vehicle. Decomposition: At extremely high temperatures, the urea in your DEF can break down into ammonia and isocyanic acid. If this happens, your vehicle might produce more NOx emissions or even limit its power to protect the engine and environment. This means it may not effectively reduce emissions anymore.
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