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    AI Overview
    AdBlue® for Diesel cars with SCR Technology | OP | OpenParts
    AdBlue is an automotive product that reduces nitrogen oxide emissions from diesel engines by converting them into harmless nitrogen and water through a process called selective catalytic reduction (SCR). It is a fluid made of a 32.5% urea solution and 67.5% deionized water. Modern diesel cars and trucks often require it to meet emissions standards, and the vehicle's engine will not restart if the AdBlue tank runs empty. 
    How AdBlue works 
    • Injection: When the engine runs, AdBlue is injected into the exhaust stream.
    • Decomposition: The heat from the exhaust gas turns the urea into ammonia.
    • Chemical reaction: The ammonia then reacts with the harmful nitrogen oxides (
      NOxcap N cap O sub x
      𝑁𝑂𝑥
      ) produced by the engine.
    • Conversion: This reaction converts the
      NOxcap N cap O sub x
      𝑁𝑂𝑥
       into nitrogen (
      N2cap N sub 2
      𝑁2
      ) and water (
      H2Ocap H sub 2 cap O
      𝐻2𝑂
      ), which are harmless and naturally present in the air.       
    Why it's important 
    • Emissions reduction: AdBlue is crucial for reducing air pollution caused by diesel engines, helping vehicles meet stringent emissions standards like Euro 4, 5, and 6.
    • Engine protection: It ensures the vehicle's SCR system operates correctly, preventing potential damage or costly repairs.
    • Vehicle performance: While it's an emission control product, its use is associated with fuel efficiency and constant engine output, as it can lead to reduced fuel consumption and less unburned fuel without affecting engine performance. 
    What to know as a driver 
    • Warning light: Your vehicle has a dashboard warning light that indicates low AdBlue levels and will alert you to refill the tank.
    • Refill requirement: You must refill the tank before it completely empties, as the engine will not restart once the tank is empty.
    • Filling the tank: AdBlue is stored in a separate, dedicated tank and is never mixed with diesel fuel. You can refill the tank yourself using a purchased canister or by pumping it from a dedicated AdBlue bowser at service stations.
    • Location: The AdBlue tank is typically found near the fuel filler cap or in the boot, sometimes with a blue cap.
    • Consumption: AdBlue consumption varies based on driving style and engine size, but a general average is about one liter per 1,000 kilometers for a passenger car. 
    • AdBlue® - BASF
      AdBlue® is a high purity, 32.5% urea solution directly injected into the exhaust gas where it serves as reducing agent. The releas...
      BASF
    • AdBlue Fluid - The Facts, the Myths & its Usage - Nationwide Fuels
      How does AdBlue fluid work? Polluting chemicals and compounds, including Nitrogen Oxide and Nitrogen Dioxide, are produced when di...
      Nationwide Fuels
    • What Is AdBlue and How Does It Work? - CarParts.com
      Aug 14, 2025 — Well-known brands such as Audi, BMW, Toyota, and Mercedes-Benz all have diesel vehicles that use AdBlue. Some specific...
      CarParts.com
    Show all
    • AdBlue® - BASF
      AdBlue® is a high purity, 32.5% urea solution directly injected into the exhaust gas where it serves as reducing agent. The releas...
      BASF
    • AdBlue Fluid - The Facts, the Myths & its Usage - Nationwide Fuels
      How does AdBlue fluid work? Polluting chemicals and compounds, including Nitrogen Oxide and Nitrogen Dioxide, are produced when di...
      Nationwide Fuels
    • What Is AdBlue and How Does It Work? - CarParts.com
      Aug 14, 2025 — Well-known brands such as Audi, BMW, Toyota, and Mercedes-Benz all have diesel vehicles that use AdBlue. Some specific...
      CarParts.com
    • EVERYTHING YOU NEED TO KNOW ABOUT ADBLUE
      Jul 14, 2021 — 2/ What is it for? It causes the decomposition of exhaust particles produced by the catalytic converters of diesel eng...
      PRINZ Automotive
    • Everything You Need to Know About AdBlue - Eurowag
      Sep 5, 2023 — Keep in mind that you must use AdBlue if your car is fitted with it. If you fail to refill it at the appropriate time, ...
      Eurowag
    • Product AdBlue® 10l blue def diesel exhaust fluid to reduce car ...
      * Car Antifreeze liquid Engine Coolant for cooling and freezing systems. Antifreeze coolant is specially formulated with cutting-e...
      Guangzhou EverBlue Technology Co.,Ltd.
    • AdBlue® | VDA
      The VDA is striving to make AdBlue® available worldwide. The brand is registered or in the process of being registered in all rele...
      Verband der Automobilindustrie e.V. | VDA
    • What Is Adblue® And Why Does It Matter? - Valvoline™ Global
      In diesel engines, the reaction of oxygen and nitrogen at high temperatures causes the creation of nitrogen oxide. Its formation i...
      Valvoline™ Global
    • What is AdBlue and why does your diesel vehicle need it - Frotcom
      Feb 17, 2019 — How much AdBlue fluid is needed? Although tanks are filled every six months during maintenance, the rate at which cars...
      Frotcom
    • AdBlue®: What it is and how it works | Motorists| TotalEnergies UK
      What is AdBlue made of? AdBlue® is made of a colourless mixture of high-purity urea (32.5%) and deionised water (67.5%), as set ou...
      totalenergies.co.uk
    • Everything You Need to Know About AdBlue - Motorama
      You'll find AdBlue in a bottle at the servo in the little automotive section next to the engine oils and car wash products. At man...
      Motorama.com.au
    • What is AdBlue? Why does your car need it? | RAC Drive
      Feb 24, 2025 — In many vehicles, the AdBlue tank is located near the fuel filler cap, often next to it or just a little further behin...
      RAC
    • AdBlue – what is it and how does it work? - HOGS
      Jul 21, 2025 — Okay, but where did AdBlue actually come from and when was it introduced? Although it may seem that AdBlue is a recent...
      HOGS
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    Can I just use water instead of AdBlue?
    If you add water instead of AdBlue®, it can potentially be extremely damaging and expensive. This is because water can block your car's AdBlue® injector, negatively affect the catalyst and ultimately cause the SCR (Selective Catalytic Reduction) system to fail, which can stop your engine from functioning.

    How to solve problems with AdBlue | Motorists | TotalEnergies UK


    Total Energies UK
    https://totalenergies.co.uk › how-solve-problems-adbluer
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    What does AdBlue do for your vehicle?
    AdBlue® is a colourless, non-toxic liquid that is a solution of water and urea. It works to convert nitrogen oxide emissions in the exhaust gas of diesel engines, into nitrogen and water. A particulate filter then further reduces solid particulates from the vehicle's exhaust emissions.

    What is AdBlue®? - Ford UK


    Ford UK
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    Can I fill up AdBlue myself?
    What is AdBlue? AdBlue Diesel Exhaust | The AA
    You can refill the Adblue tank yourself. Typically, you'll find an easily accessible AdBlue filler cap right next to the diesel filler cap. Simply unscrew the cap and pour in the AdBlue solution.Jan 5, 2017

    What is AdBlue? AdBlue Diesel Exhaust - The AA


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