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AdBlue (or Diesel Exhaust Fluid - DEF) is a non-toxic, 32.5% high-purity urea and 67.5% deionized water solution used in Selective Catalytic Reduction (SCR) systems. It converts harmful
emissions from diesel engines into harmless nitrogen and water vapour. It is essential for modern diesel vehicles to meet environmental standards, typically stored in a separate tank.
This video explains how AdBlue works in an SCR system:
Key Details About SCR/AdBlue Systems
- Composition: It is not a fuel additive; it is a specialized liquid () sprayed into the exhaust stream.
- Usage: AdBlue consumption is usually 4–5% of diesel fuel consumption.
- Storage & Handling: It is highly corrosive to metals, requiring plastic storage and handling systems.
- Cold Weather Issues: AdBlue freezes at approximately -11.5°C (11.3°F), though vehicles have heating systems to prevent this.
- System Maintenance: To prevent urea crystallization and injector blockages, specially formulated additives like MotorPower Care DEF Guard Additive or Rislone DEF Crystal Clean are sometimes used.
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People also ask
What does SCR mean on AdBlue?
Selective catalytic reduction
The SCR “Selective catalytic reduction” system is a mean of converting the nitrogen oxides (NOx) into water and nitrogen (without the oxides). As presented in the diagram, the AdBlue® solution (32.5% of UREA + 67.5% of pure water) is injected in the SCR catalyst.Feb 21, 2017
What is the SCR system? - GreenChem AdBlue4you
What is AdBlue®? GreenChem Adblue4you
https://www.greenchem-adblue.com › scr-system
What is AdBlue®? GreenChem Adblue4you
https://www.greenchem-adblue.com › scr-system
What is the difference between SCR and AdBlue?
SCR stands for selective catalytic reduction, which is a technology used for reducing nitrogen oxides (NOx) from the exhaust gas of diesel engines. 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.
What is the SCR technology with AdBlue?
my-customerportal.com
https://peugeot.my-customerportal.com › peugeot › article
my-customerportal.com
https://peugeot.my-customerportal.com › peugeot › article
Web results
SCR System & DEF (AdBlue): How It Works and Remove ...
dl.ge
https://dl.ge › blog
dl.ge
https://dl.ge › blog
Sep 22, 2025 — Learn how the SCR system and AdBlue work in trucks. Common faults, repair costs, and safe disable options like emulators and ECU tuning.
Adblue SCR System,Diesel Exhaust Fluid Urea Solution ...
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › blog_5
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › blog_5
The SCR scheme has obvious advantages in the national IV diesel vehicle exhaust emission treatment system and Diesel Exhaust Fluid for vehicles is a necessary ...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
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
Diesel exhaust fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue [3] ) is a liquid used to reduce the amount of air pollution created by a ...Read more
The Benefits of Diesel Exhaust Fluid (DEF) Additivation on ...
SAE International
https://www.sae.org › Articles
SAE International
https://www.sae.org › Articles
Oct 7, 2017 — Diesel Exhaust Fluid (DEF) like Adblue® is a urea/water solution injected upstream from the SCR catalyst. Urea decomposes into ammonia (NH3) ...
DEF Crystal Clean® Diesel DEF & SCR Emissions System ...
Rislone
https://rislone.com › Products › Diesel Exhaust Fluid
Rislone
https://rislone.com › Products › Diesel Exhaust Fluid
DEF Crystal Clean gives a cleaning effect on the entire SCR system by working to dissolve the white crystal deposits that form in the tank, pump, heater, ...Read more
„AdBlue” SCR DEF Emulator
4DPF
https://4dpf.com › adblue-scr-diesel-exhaust-fluid-def-e...
4DPF
https://4dpf.com › adblue-scr-diesel-exhaust-fluid-def-e...
Apr 23, 2024 — SCR/DEF emulator is a device that emulates a fully functional SCR/DEF system. Once installed, the emulator emits the same signals as a fully functioning SCR/ ...Read more
Discussions and forums
How To Clean Your DEF System and Help Prevent Costly Repairs
PowerStroke.org ·
2 years ago
How To Clean Your DEF System and Help Prevent Costly Repairs
PowerStroke.org ·
2 years ago
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
What does DEF / AdBlu do for Diesel Engines? What are the benefits, why ...
Quora ·
5 answers
· 4 years ago
What does DEF / AdBlu do for Diesel Engines? What are the benefits, why ...
Quora ·
5 answers
· 4 years ago
See more
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