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The Importance of DEF Quality

When consumers are asked what is important about purchasing products, they usually focus on their personal satisfaction with the product. This means that they want to make sure that the product is worth their money and even worth the time it takes to purchase the product. To this end, consumers want knowledgeable and available staff with friendly people, convenience, cost effectiveness, and a good value. As far as a good value, customers want to make sure that they get a quality product for the price they pay. So why does diesel exhaust fluid (DEF) quality matter? How can consumers understand DEF quality? Read on to discover the answers to these questions and more.


DEF quality is extremely important to the performance of the selective catalytic reduction (SCR) technology. If the DEF quality isn’t as high as it needs to be, it can affect the ability of the selective catalytic reduction to properly control and reduce diesel emissions. If you know how SCR and DEF work, then you know that DEF is injected into the exhaust stream where it mixes and reacts to NOx, and changes it into harmless nitrogen and water. If the DEF quality doesn’t meet industry standards, it can cause serious damage to the system and require servicing.

DEF quality must be at industry standards in order to avoid potential major problems like voided vehicle warranties, defective SCR performances, lower fuel economy, and ruined filters and injectors. An independent organization, American Petroleum Institute (API), monitors DEF for quality. If a company has been API certified, then they have passed rigorous tests to ensure their DEF quality. In order to maintain the quality of the DEF, distributors and end users must ensure cleanliness. Unfortunately, even some mild dust can contaminate the liquid and thus ruin the DEF quality. There is some educational material out there on the storage and handling of DEF in order to help everyone properly maintain the quality of DEF.

The main thing to note is that SCR systems are extremely sensitive to potential chemical impurities in the urea solution. That is why urea is mixed with de-ionized and de-mineralized water. While dust and dirt can contaminate the liquid, DEF is much more likely to be contaminated due to impurities in the water. To this effect, Victory Blue goes a step further to ensure the quality of our product. While only Grade III water is required by the ISO standard, Victory Blue produces Grade I water to increase protection of the fluid. DEF quality matters for the consumer who needs it for use in their diesel vehicle.

Quality matters for whatever product you’re selling. Consumers want quality products, but they also want to make sure that they are getting a good value. DEF quality is particularly important because it can affect the selective catalytic reduction system, and thus result in some serious damages. That’s why it’s important to use companies that you can trust, and make sure that you keep the DEF lid and area clean of dust, debris, or dirt! If you have any questions about the quality of DEF, please contact Victory Blue and we’ll be happy to help!

Drive with Confidence, Drive with Victory.