Diesel exhaust fluid (DEF) has become an essential component in modern diesel engines, particularly those equipped with selective catalytic reduction (SCR) systems. While all DEF products are designed to meet certain standards, discerning users understand that not all DEFs are created equal. Subtle differences in quality can significantly impact engine performance and longevity.
This selection guide was created to help you understand nuances of DEF, the importance of adhering to standards like ISO 22241, and how to select the best DEF for your needs.
DEF is a non-toxic, colorless, and non-flammable solution composed of 32.5% high-purity urea and 67.5% deionized water. Its primary function is to reduce harmful nitrogen oxide (NOx) emissions from diesel engines. When injected into the exhaust stream of an SCR-equipped engine, DEF undergoes a chemical reaction that transforms NOx into harmless nitrogen and water vapor, thereby mitigating environmental pollution.
To ensure DEF's efficacy and compatibility with SCR systems, it must conform to the ISO 22241 standard. This international standard specifies the quality characteristics of DEF, ensuring that it meets the necessary purity and composition requirements.
Adherence to ISO 22241 is crucial, as using substandard DEF can lead to SCR system malfunctions, increased emissions, and potential engine damage.
Before you choose the first DEF product that you see in a store or that shows up on your Google search, take a second to really get to know your options. There are some DEF products that are better at protecting your engine and ensuring optimal performance than others.
Here are a few things you’ll want to look for when exploring your options.
Impurities in DEF can clog the SCR catalyst, leading to system inefficiencies or failures. Ensure the DEF you choose is free from contaminants and meets the stringent purity requirements outlined in ISO 22241.
Established manufacturers with a history of producing high-quality DEF are more likely to provide reliable products. Researching customer reviews and industry feedback can offer insights into a manufacturer's credibility.
Consistent access to DEF is vital, especially for businesses operating fleets. Opt for brands that have a robust and reliable distribution network, ensuring product availability when you need it.
DEF is available in various packaging options, from small containers for personal vehicles to bulk deliveries for large fleets. Choose a supplier that offers packaging sizes aligning with your consumption needs.
The American Petroleum Institute (API) provides a certification program for DEF products, ensuring they meet specific quality standards. Additionally, verify that the DEF aligns with or exceeds Original Equipment Manufacturer (OEM) specifications for your vehicle or equipment.
Among the many DEF products available, we recommend BlueDEF most often to our customers. It sets the industry standard as the best diesel exhaust fluid. Here’s why.
Shop BlueDEF (and get free shipping!) here →
Selecting the right DEF is only part of the equation; partnering with a reputable supplier ensures consistent product quality and availability.
At Keller-Heartt, we’re dedicated to ensuring you get the high-quality DEF you need exactly when you need it. With a range of quantities, fast and free shipping, and an exceptional customer service team to back it all up, we can be the one-stop shop you need to keep your vehicle or fleet running.
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