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  • Writer's pictureGaurav Chakraborty

What is AdBlue? Why is it needed?

With the introduction of BS6 emission norms, the goal is to produce less harmful exhaust emission gases. Which requires automobile companies to either develop an all-new engine or implement use of AdBlue to cut down on emission of harmful exhaust gases. As the development of an all-new engine is expensive and takes a lot of R&D companies have come up with an easier solution with Adblue. Many companies that provide diesel-powered vehicles use AdBlue to meet the emission norms. Be it light motor vehicles, trucks, or agricultural machines all use the AdBlue.

What is AdBlue basically?

AdBlue is a diesel exhaust fluid, NOT a fuel additive. AdBlue is a clear mixture of de-ionised water and pure urea (32.5%) and is also referred to as Diesel Exhaust Fluid (DEF), BlueTEC or AUS-32.

How does Adblue work? What do we need it?

The SCR located behind the particulate filter in the exhaust consists of a sensor. When a certain amount of NOx wants to enter the catalyst, the sensor calculates a measured dose of AdBlue which is injected from the AdBlue reservoir.

When this solution combines with exhaust emissions, it breaks down the harmful mono-nitrogen oxides in diesel exhaust. Inside the SCR (Selective Catalytic Reduction) catalyst, harmful nitrogen oxide in the exhaust reacts with the ammonia in urea and is transformed into harmless nitrogen and water. Thus releasing less harmless gases from the exhaust. Also, this system has been in existence over a decade thus being fool-proof.

Does AdBlue affect fuel consumption or improves my vehicle performance?

AdBlue has no direct effect on the functioning of the engine. It helps to reduce the polluting emissions to meet the emission norms. In case the AdBlue tank runs dry, the performance of the engine will be limited to produce less pollution or may not start the engine if stopped.

When the warning light first comes on you’ll have enough time to refill hence nothing to worry. Just make sure it is addressed soon.

As per Mercedes Benz on average, 1-liter of AdBlue will last for 1,000 Km which can vary once again with usage and driving style. The AdBlue also has a lifespan of 2 years from the date of production.

What happens if one adds Diesel in AdBlue tank?

Adding it directly into your fuel tank could cause expensive damage to your fuel tank, pump, and injection system. Do not start the engine, call for your Authorized Service Center (ASC).

Does my vehicle require AdBlue?

Check for the following

  • The vehicle user manual or handbook.

  • See if there’s an AdBlue filler cap either next to the fuel filler, in the boot or under the bonnet.

  • If the model name contains ‘Blue’ or ‘SCR’.

  • If you’re still not sure, ask the dealer.

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