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    An AI Overview is not available for this searchCan't generate an AI overview right now. Try again later.
    AI Overview
    AdBlue (Diesel Exhaust Fluid) is a 32.5% high-purity urea solution used in Selective Catalytic Reduction (SCR) systems to convert harmful nitrogen oxides (NOx) into nitrogen and water vapor, reducing diesel emissions. Stored in a separate tank, it is injected into the exhaust, improving air quality and ensuring compliance with Euro 4, 5, and 6 standards. 
    Key Aspects of AdBlue & SCR Systems 
    • Composition: 32.5% urea, 67.5% demineralized water.
    • Operation: Injected into the exhaust, where heat breaks it down into ammonia, which then reacts with NOx in the catalyst.
    • System Maintenance: AdBlue can form crystals at low operating temperatures, which can block lines and injectors.
    • Preventative Treatment: Products like Rislone DEF Crystal Clean or Liqui Moly DEF Anti Crystal Additive can prevent/clean crystal buildup in the tank and injectors.
    • Freezing Point: AdBlue freezes at -11°C, so systems often have heaters.
    • Failure Consequences: If a vehicle runs out of AdBlue, it will enter "limp home" mode or fail to start. 
    Recommended Care 
    • Ensure the AdBlue used adheres to ISO 22241 or DIN 70070 standards to avoid damaging the SCR catalyst.
    • Use anti-crystallization additives to protect the SCR system, especially if the vehicle is used for short trips.
    • Do not mistake DEF with fuel; it must only go into the dedicated AdBlue tank. 
    • What is the SCR system? - GreenChem AdBlue4you
      Feb 21, 2017 — The SCR system uses AdBlue, a solution of 32.5% urea and 67.5% pure water. The AdBlue is injected into the SCR catalyst, where a r...
      greenchem-adblue.com
    • MotorPower Care DEF Guard Additive – Anti-Crystallizer ...
      Prevents Crystallization & Protects Your SCR System. MotorPower Care DEF Guard Additive is a high-performance DEF (AdBlue®) treatm...
      MotorPower Care
    • What is AdBlue? Why does your car need it? | RAC Drive
      Feb 25, 2026 — AdBlue is made from a urea and water solution, which is stored in a separate tank within the vehicle. The urea contains ammonia wh...
      RAC
    Show all
    • What is the SCR system? - GreenChem AdBlue4you
      Feb 21, 2017 — The SCR system uses AdBlue, a solution of 32.5% urea and 67.5% pure water. The AdBlue is injected into the SCR catalyst, where a r...
      greenchem-adblue.com
    • MotorPower Care DEF Guard Additive – Anti-Crystallizer ...
      Prevents Crystallization & Protects Your SCR System. MotorPower Care DEF Guard Additive is a high-performance DEF (AdBlue®) treatm...
      MotorPower Care
    • What is AdBlue? Why does your car need it? | RAC Drive
      Feb 25, 2026 — AdBlue is made from a urea and water solution, which is stored in a separate tank within the vehicle. The urea contains ammonia wh...
      RAC
    • Understanding the role of AdBlue® in SCR pollution control ...
      Nov 15, 2024 — AdBlue® is an aqueous solution used in diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems to reduce emissio...
      Bardahl
    • SCR Solution Suppliers & Manufacturers & Exporter - NewBlue
      SCR Solution is used by modern SCR (Selective catalytic reduction) systems as a way to help reduce the emissions of nitrogen oxide...
      Shandong New Blue Environmental Protection Technology Co.,Ltd
    • Simple and effective prevention of crystals in the SCR system | LIQUI MOLY
      Nov 7, 2025 — The SCR system uses a urea solution, like AdBlue®, to reduce harmful nitrogen oxides. Crystal formation can occur in the following...
      Liqui Moly
    • Rislone CRYSTAL CLEAN™ Diesel DEF/AdBlue & SCR ...
      Oct 21, 2024 — and that make frequent stops are often more prone to forming these deposits in the SCR. system as the deposits accumulate it could...
      2m
      YouTube·Rislone
    • TotalEnergies - AdBlue® and SCR 3D video
      Apr 11, 2022 — combined with STR. technology AdBlue transforms the nitrogen oxides NOOX emitted by the diesel engine into nitrogen. and water vap...
      1:01
      YouTube·TotalEnergies
    • What is the SCR technology with AdBlue? - Citroen
      SCR stands for selective catalytic reduction, which is a technology used for reducing nitrogen oxides (NOx) from the exhaust gas o...
      Stellantis.com
    • AdBlue - What is it, and what does it do with your Diesel ...
      May 6, 2017 — inabgoadblue. • 9y ago. To curb the harmful emissions you can make use of Adblue. Ad blue is a reagent which allows the SCR (Selec...
      3:09
      Reddit·4WD DIY
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    My Ad Center
    Videos
    The AdBlue you should use to prevent a breakdown.
    YouTube · ADVANCED FLEET MANAGEMENT TUBE
    3 weeks ago
    YouTube · ADVANCED FLEET MANAGEMENT TUBE
    9:06
    Always use manufacturer-authorized AdBlue & anti-crystallization additives that meet ISO 22,241 to prevent costly SCR system repairs.
    ADVANCED FLEET MANAGEMENT TUBE
    YouTube·
    Apr 13, 2026

    The AdBlue you should use to prevent a breakdown.

    YouTube·ADVANCED FLEET MANAGEMENT TUBE·Apr 13, 2026
    YouTube
    The Truth About AdBlue, DEF, and SCR Technology
    YouTube · Ben Johnson Automotive Fault Finding
    May 22, 2024
    YouTube · Ben Johnson Automotive Fault Finding
    14:46
    This video will explain how and why ad blue low efficiency fault codes occur and how to stop them from returning.
    Ben Johnson Automotive Fault Finding
    YouTube·
    May 22, 2024

    The Truth About AdBlue, DEF, and SCR Technology

    YouTube·Ben Johnson Automotive Fault Finding·May 22, 2024
    YouTube
    In this video
    • 00:00
      Introduction
    • 00:57
      What is SCR? What is NOx?
    • 01:21
      What is AdBlue?
    • 02:12
      What are the SCR components?
    • 02:58
      SCR unit functions
    • 03:38
      DDE functions
    • 04:10
      The SCR active tank
    • 05:01
      The metering valve
    • 05:54
      The feed pipe
    • 06:19
      NTC temp sender
    • 07:30
      NOx sensors
    • 09:00
      Under car components layout
    • 09:31
      Checking AdBlue mixture with a refractometer
    • 09:44
      Common leak points
    • 10:16
      Metering valve crystallisation
    • 10:26
      Bulging metering valve body, spray pattern, and flow rate
    • 10:50
      Diagnosing the NOx concentration and why this may cause fault code for poor quality AdBlue detected
    • 12:44
      Swapping the front and rear NOx sensors around
    • 13:17
      Replacing the faulty NOx sensor
    • 13:33
      Conclusion and fault found
    TotalEnergies - AdBlue® and SCR 3D video
    YouTube · TotalEnergies
    Apr 11, 2022
    YouTube · TotalEnergies
    1:01
    AdBlue transforms nitrogen oxides emitted by diesel engines into non-polluting nitrogen and water vapor using SCR technology.
    TotalEnergies
    YouTube·
    Apr 11, 2022

    TotalEnergies - AdBlue® and SCR 3D video

    YouTube·TotalEnergies·Apr 11, 2022
    YouTube
    How does the Adblue SCR DEF system work? Explained ...
    YouTube · GarageTech
    Jan 21, 2018
    YouTube · GarageTech
    7:38
    AdBlue, or DEF, is a deionized water and urea solution that reduces NOx emissions by converting them into nitrogen and water.
    GarageTech
    YouTube·
    Jan 21, 2018

    How does the Adblue SCR DEF system work? Explained ...

    YouTube·GarageTech·Jan 21, 2018
    YouTube
    In this video
    • 00:07
      Intro
    • 00:18
      What is NOx?
    • 00:47
      How does the AdBlue system work?
    • 01:25
      How does the NOx oxidation catalyst work?
    • 01:57
      How does the DPF catalyst work?
    • 03:33
      Ammonia injection
    • 03:48
      What is AdBlue
    • 04:17
      Adblue tank
    • 05:29
      AdBlue Pump
    • 07:15
      Ammonia conversion
    View all
    People also ask
    What is AdBlue for SCR?
    A non-toxic, non-flammable, odourless and biodegradable fluid, AdBlue works in conjunction with a treatment system known as Selective Catalytic Reduction (SCR) to reduce harmful NOx (nitrogen oxide) gas.Feb 25, 2026

    What is AdBlue? Why does your car need it? | RAC Drive


    RAC
    https://www.rac.co.uk › ... › Emissions
    RAC
    https://www.rac.co.uk › ... › Emissions
    Does SCR use AdBlue?
    AdBlue® is an aqueous solution used in diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems to reduce emissions of pollutant gases, including nitrogen oxides (NOx).

    Understanding the role of AdBlue® in SCR pollution control ...


    Bardahl
    https://english.bardahl.fr › en-us › tips-and-tricks › und...
    Bardahl
    https://english.bardahl.fr › en-us › tips-and-tricks › und...
    How to make AdBlue solution at home?
    o Take 67.5% deionized water in a stainless steel mixing tank. o Heat the water to 40–50°C to help dissolve the urea faster. o Gradually add 32.5% high-purity urea into the heated water while stirring. o Ensure the urea is completely dissolved to form a clear solution. o Maintain a pH of 9.0–10.0 during mixing.

    How to Make AdBlue (Diesel Exhaust Fluid) Using Urea - atdmco.com


    atdmco.com
    https://atdmco.com › wp-content › uploads › 2025/02
    atdmco.com
    https://atdmco.com › wp-content › uploads › 2025/02
    What is urea solution for SCR?
    Aqueous Urea Solution (AUS), also known as urea water solution or Diesel Exhaust Fluid (DEF), is a chemical compound that is used in the maritime industry as part of the exhaust gas cleaning process, particularly in selective catalytic reduction (SCR) systems.

    Aqueous Urea Solution | Caldic


    Caldic
    https://www.caldic.com › maritime-chemical-solutions
    Caldic
    https://www.caldic.com › maritime-chemical-solutions

    Web results

    Simple and effective prevention of crystals in the SCR system


    Liqui Moly
    https://www.liqui-moly.com › products › tips-and-topics
    Liqui Moly
    https://www.liqui-moly.com › products › tips-and-topics
    Nov 7, 2025 — Easy to use ... Add 0.25 percent to the AdBlue® solution (1:400). 25 ml is sufficient for 10 l AdBlue®. 250 ml is sufficient for 100 l AdBlue®.Read more

    SCR Solution Suppliers & Manufacturers & Exporter


    Shandong New Blue Environmental Protection Technology Co.,Ltd
    https://www.newbluechina.com › adblue-and-def-liquid
    Shandong New Blue Environmental Protection Technology Co.,Ltd
    https://www.newbluechina.com › adblue-and-def-liquid
    SCR Solution is used by modern SCR (Selective catalytic reduction) systems as a way to help reduce the emissions of nitrogen oxides of your car.Read more

    Understanding the role of AdBlue® in SCR pollution ...


    Bardahl
    https://english.bardahl.fr › en-us › tips-and-tricks › und...
    Bardahl
    https://english.bardahl.fr › en-us › tips-and-tricks › und...
    AdBlue is an aqueous solution used in diesel vehicles equipped with Selective Catalytic Reduction (SCR) systems to reduce emissions of pollutant gases.Read more

    Adblue SCR System,Diesel Exhaust Fluid Urea Solution ...


    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › blog_3
    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › blog_3
    AdBlue® is a urea-water solution used in diesel vehicle emission control systems to reduce nitrogen oxide emissions. AdBlue® complies with European ...Read more

    Anti-Crystallizer & SCR System Cleaner for Diesel Vehicles ...


    MotorPower Care
    https://mpcare.com › products › def-scr-additive-diesel-...
    MotorPower Care
    https://mpcare.com › products › def-scr-additive-diesel-...
    ✓ Prevents & Removes Crystallization – Cleans and prevents harmful crystal deposits in DEF (AdBlue®) metering systems, injectors, and SCR catalytic converters.Read more
    $19.99 · In stock · Free delivery · 15-day returns

    What is the SCR technology with AdBlue?


    Stellantis.com
    https://citroen.my-customerportal.com › citroen › article
    Stellantis.com
    https://citroen.my-customerportal.com › citroen › article
    It's based on AdBlue® - also called diesel exhaust fluid - a 32.5% urea solution in purified water, which is injected into the exhaust pipe. The urea in the ...Read more

    What is the SCR system?


    greenchem-adblue.com
    https://www.greenchem-adblue.com › scr-system
    greenchem-adblue.com
    https://www.greenchem-adblue.com › scr-system
    Feb 21, 2017 — The SCR “Selective catalytic reduction” system is a mean of converting the nitrogen oxides (NOx) into water and nitrogen (without the oxides).Read more
    Discussions and forums
    Diesel SCR/AdBlue issues: prevention and fixes | Engine
    MBClub UK · 
    3 years ago
    Diesel SCR/AdBlue issues: prevention and fixes | Engine
    MBClub UK · 
    3 years ago
    ... SCR/AdBlue system - the ... Simple solution - buy a petrol car. Like. Reactions: markjay · Feb 6 ...  More
    AdBlue - What is it, and what does it do with your Diesel Exhaust
    Reddit · 
    r/Diesel
     · 5 comments
     · 8 years ago
    AdBlue - What is it, and what does it do with your Diesel Exhaust
    Reddit · 
    r/Diesel
     · 5 comments
     · 8 years ago
    To curb the harmful emissions you can make use of Adblue. Ad blue is a reagent which allows the SCR (Selective Catalytic Reduction) ...  More
    AdBlue (SCR System) Info/FAQ's
    Vauxhall Owners Network Forum · 
    4 years ago
    AdBlue (SCR System) Info/FAQ's
    Vauxhall Owners Network Forum · 
    4 years ago
    Adblue is a solution made up synthetic Urea and water. The sole purpose of the AdBlue system is to neutralise harmful NOx emissions produced by diesel eng...  More
    See more

    Web results

    What is AdBlue? Why does your car need it?


    RAC
    https://www.rac.co.uk › ... › Emissions
    RAC
    https://www.rac.co.uk › ... › Emissions
    Feb 25, 2026 — AdBlue is typically used in diesel-powered vehicles that are equipped with a Selective Catalytic Reduction (SCR) system to reduce harmful ...Read more
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      Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment By AdBlue, Two Half Gallon Bottles (1 Gallon / 3.78-Liters Total), For Land Rover Discovery
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