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AdBlue Explained: Everything You Need to Know

AdBlue is one of those things you might have seen at petrol stations or heard about in the context of diesel vehicles, but what actually is it, and why is it so important?

We’ve broken it down into 10 easy steps to keep you clued up. Let’s dive into it!

1. What is AdBlue?

AdBlue is a liquid solution used in modern diesel vehicles equipped with SCR (selective catalytic reduction) technology. It’s not a fuel additive, but a separate fluid stored in its own tank in your vehicle. Made of deionized water and urea (yes, a compound found in wee), it’s vital for reducing harmful emissions. 

2. Why Do Vehicles Need it?

Diesel engines produce nitrogen oxides (NOx), harmful pollutants that contribute to smog and respiratory issues. AdBlue helps break down NOx emissions into harmless nitrogen and water vapour before the exit the exhaust. It’s all about meeting strict emission standards and keeping the air cleaner.

3. How Does AdBlue Work?

A common misconception is that it’s injected into your fuel tank. Instead, it’s sprayed into the exhaust system. The heat from the exhaust turns AdBlue into ammonia, which reacts with NOx in the SCR catalyst, converting it into nitrogen and water. Voila, cleaner emissions!

5. Why is it Important for the Environment?

Reducing NOx emissions is critical for lowering air pollution. This solution plays a key role in making diesel engines greener by helping them comply with environmental regulations like Euro 6 standards.

AdBlue Filler Cap - What Is AdBlue Blog - CCM Garages

6. What Happens if You Don't Use AdBlue?

Trust us, this is something you don’t want to do. If your vehicle requires Adblue and you run out – you’re in big trouble.

Most modern engines are smart enough to restrict performance or refuse to start until the AdBlue has been refilled. Ignoring it isn’t just bad for the environment, it can also result in costly repairs. Common faults can include, but are not limited to:

  • SCR catalyst damage
  • DPF issues
  • Sensor failures
  • Injector system blockages
  • ECU recalibration or faults

7. Do All Diesels Use AdBlue?

Not all diesels require it. It’s usually used in cars, vans and trucks with SCR technology, which is common for vehicles manufactured after 2014. If your car needs AdBlue, there will be a separate filler cap – often near the fuel cap or in the boot.

8. How Often Do You Need to Refill Adblue?

The frequency depends on your vehicle and driving habits. On average, you’ll use about 1 litre of every 600-1,000 miles. You should get an alert on your dash when your levels are low, so make sure you don’t ignore this warning!

9. What Happens if You Use the Wrong Fluid?

Adblue isn’t interchangeable with any other fluids – not water, or another fuel additive. Using the wrong fluid can damage your SCR system, leading to expensive repairs. Only use certified AdBlue that meets ISO 22241 standards.

10. Can You Refill AdBlue Yourself?

Absolutely, AdBlue is widely available at petorl stations, online and in car shops. Refilling is as simple as topping up your washer fluid. Just make sure to use a clean funnel to avoid contamination, or buy bottles with a built in spout.

Bonus Tips

  • Storage: Keep it in a cool, dry place, as it can degrade in extreme temperatures
  • Shelf Life: Opened bottle should be used within a year for best results
  • Spill Alert: AdBlue can be corrosive, so clean up spills immediately to protect your cars paint and metal surfaces
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