If you operate a modern diesel fleet, you've likely heard of AdBlue®. But what exactly is it, and why has it become essential for diesel vehicles? This comprehensive guide explains everything you need to know about AdBlue® and its critical role in reducing emissions.
AdBlue® (also known as Diesel Exhaust Fluid or DEF) is a high-purity solution composed of 32.5% urea and 67.5% deionized water. Despite common misconceptions, it's not a fuel additive—AdBlue® is stored in a separate tank and is never mixed with diesel fuel.
The name "AdBlue®" is a registered trademark of the German Association of the Automotive Industry (VDA), and it represents a standardized product that meets strict ISO 22241 specifications. This ensures consistent quality and performance across all manufacturers.
AdBlue® works with Selective Catalytic Reduction (SCR) technology—an advanced emissions control system installed in modern diesel engines. Here's the process:
AdBlue® is injected into the exhaust stream before it reaches the SCR catalyst.
The heat converts AdBlue® into ammonia (NH₃), which reacts with harmful nitrogen oxides (NOx).
NOx emissions are converted into harmless nitrogen (N₂) and water vapor (H₂O).
The result? Up to 90% reduction in NOx emissions, helping meet strict environmental standards.
Most modern diesel vehicles (Euro 4, Euro 5, Euro 6, and equivalent Australian standards) are legally required to use AdBlue®. Operating without it can result in fines and vehicle de-registration.
Modern diesel engines are designed to work with SCR systems. Running out of AdBlue® will trigger warnings, and eventually, the vehicle will enter "limp mode" or refuse to start until the tank is refilled.
Using non-compliant or contaminated AdBlue® can damage your SCR system, leading to costly repairs that may not be covered under warranty. Always use ISO 22241-certified product.
Nitrogen oxides contribute to smog, acid rain, and respiratory problems. Using AdBlue® significantly reduces your fleet's environmental impact and demonstrates corporate responsibility.
Typically, AdBlue® consumption is approximately 3-6% of diesel fuel consumption. For example, if your vehicle uses 100 liters of diesel, you'll need 3-6 liters of AdBlue®. Consumption varies based on engine type, load, driving conditions, and emissions standards.
Your vehicle will warn you when AdBlue® levels are low. If you completely run out, most modern vehicles will limit engine power (limp mode) or prevent the engine from restarting after shutdown. It's designed this way to ensure emissions compliance—so always keep your AdBlue® tank topped up.
Yes. When stored correctly (between 0-30°C, away from direct sunlight, in sealed containers), AdBlue® typically has a shelf life of 12-18 months. Higher temperatures accelerate degradation. Always check the manufacturing date and use older stock first.
As long as the product is ISO 22241-certified and VDA-licensed, it will meet the required purity standards. At EZ Fluid Solutions, all our AdBlue® is manufactured to these strict specifications with full NATA laboratory testing and certification of analysis provided.
EZ Fluid Solutions supplies ISO 22241-certified, VDA-licensed AdBlue® with full NATA testing. Available in 10L bottles, IBCs, or bulk delivery across Queensland.