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) emissions in diesel engines equipped with Selective Catalytic Reduction (SCR) technology. Composed of 32.5% urea and 67.5% deionized water, it is standardized under ISO 22241 and is widely known as AdBlue or Diesel Exhaust Fluid (DEF).
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What is the meaning of AUS 32?
Diesel exhaust fluid
Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water.
Diesel exhaust fluid - Wikipedia
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
Wikipedia
https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
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
TotalEnergies UK
https://totalenergies.co.uk › how-solve-problems-adbluer
TotalEnergies UK
https://totalenergies.co.uk › how-solve-problems-adbluer
What are the risks of using expired AdBlue?
If AdBlue ® with an expired use period is used, the Selective Catalytic Reduction (SCR) System may not operate normally. Do not store AdBlue ® in the vehicle. AdBlue ® may deteriorate or the interior may be damaged due to fluid leakage from the container.
AdBlue ® (With Selective Catalytic Reduction (SCR) System) - Mazda
Mazda
https://owners-manual.mazda.com › gen › contents
Mazda
https://owners-manual.mazda.com › gen › contents
Web results
6 things to know about AdBlue®, DEF, AUS32, ARLA32
Palamatic Process
https://www.palamaticprocess.com › en-us › blog › six-...
Palamatic Process
https://www.palamaticprocess.com › en-us › blog › six-...
AUS32 is the generic term used for all urea solutions manufactured in accordance with ISO22241. All of these names relate to urea solutions that can be used in ...Read more
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Potential Problems. What are the potential problems with diesel exhaust fluid?
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What are the potential problems with diesel exhaust fluid?
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How It Works. How does diesel exhaust fluid work?
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How does diesel exhaust fluid work?
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Shelf Life. What is the shelf life of diesel exhaust fluid?
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What is the shelf life of diesel exhaust fluid?
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Safety Precautions. What are the safety precautions for handling diesel exhaust fluid?
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What are the safety precautions for handling diesel exhaust fluid?
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Chemical Composition. What is the chemical composition of diesel exhaust fluid?
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What is the chemical composition of diesel exhaust fluid?
What people are saying
Maintaining your DEF system.
Users share essential maintenance tips and troubleshoot common problems like crystallization and misfueling in their DEF systems.
Generative AI is experimental. Learn more
2:16
The Urea Level *or Diesel Exhaust Fluid (DEF)* Alert Indicator in Hyundai diesel vehicles is a smart reminder to refill Urea/AdBlue. A quick attention not only keeps your drive smooth and worry-free, but also ensures your car emits less harmful emission, helpin
500+ likes · Aug 21, 2025
hyundaiindia · Instagram
Indian automobile manufacturer
Diesel DEF Treatment
8.4M+ views · Mar 15, 2024
Rislone · YouTube
Automotive chemical additives
2:59
Crystallization is a major issue with DEF fluid. Rislone tells us about two products to prevent it and CEL’s, limp mode, etc. Full episode available! #dieselpodcast #dieselmechanic #truck #diesel #fyp
220.8K+ views · Sep 11, 2024
The Diesel Podcast · TikTok
Truck podcast
Correct Way to Refill DEF/Urea in Thar Roxx Diesel AX7L #adblue #tharroxxax7l
6M+ views · Jun 1, 2025
Mechanical Jugadu · YouTube
Automobile engineer & YouTuber
DEF and Diesel. An expensive combination
1.6M+ views · Jun 19, 2024
Dave's Auto Center · YouTube
Utah-based automotive repair shop
DEF Fluid is an Interesting Thing. Amazing Crystals Ruin the Pump System
951.2K+ views · Sep 17, 2025
Dave's Auto Center · YouTube
Utah-based automotive repair shop
Common DEF system failures. Diesel owners share frustrating experiences with common DEF system failures like crystallization, leaks, fault codes, and expensive misfueling mistakes.
Diesel owners share frustrating experiences with common DEF system failures like crystallization, leaks, fault codes, and expensive misfueling mistakes.
Generative AI is experimental. Learn more
DEF Fluid is an Interesting Thing. Amazing Crystals Ruin the Pump System
951.2K+ views · Sep 17, 2025
Dave's Auto Center · YouTube
Utah-based automotive repair shop
DEF and Diesel. An expensive combination
1.6M+ views · Jun 19, 2024
Dave's Auto Center · YouTube
Utah-based automotive repair shop
PSA - P20EE caused by bad DEF
40+ comments · Oct 8, 2025
r/Duramax
Reddit
💧⚠️ DEF Doser Leak Detected – Residue Found on Tail Pipe ⚠️💧
2.8K+ views · Feb 24, 2026
TAT Express Inc. · YouTube
Dallas-based diesel repair shop
EPA Tells Truck Makers to Stop Forcing Immediate Limp Mode for Low DEF
160+ comments · Aug 12, 2025
r/technology
Reddit
EPA Tells Diesel Engine Makers to Ditch One of the Most Unreliable Emissions Components
30+ comments · 1 month ago
r/technology
Reddit
Are EPA regulations ending?. Social media is abuzz with rumors about EPA rule changes that some hope will end diesel exhaust fluid requirements and allow deletes.
Social media is abuzz with rumors about EPA rule changes that some hope will end diesel exhaust fluid requirements and allow deletes.
Generative AI is experimental. Learn more
The TRUTH About EPA Diesel Deregulation... Are EGR, DPF, DEF Done?
390.1K+ views · Aug 22, 2025
Freedom Worx · YouTube
American gearhead
Are We Done with DEF? Not So Fast, This is Bad News
99.2K+ views · Aug 17, 2025
Outdoors With The Morgans · YouTube
Rural living content creator
Whoa! Hopefully this someday can carry over to pickup trucks. 😎 @kory_ppei Summary: The Trump Administration announced on March 27, 2026, that the EPA is removing the requirement for traditional Diesel Exhaust Fluid (DEF) urea quality sensors on all di
2.9K+ likes · 1 month ago
alumiduty · Instagram
Ford Super Duty enthusiast
EPA Admin Lee Zeldin & President Trump Announce Rolling Back 2027 NOx Regulations & Ending DEF
11.7K+ views · 1 week ago
TK's Garage · YouTube
Car enthusiast
Government To Allow Emissions Delete, Bye DPF, DEF, Cats And More. Finally Commonsense
207.5K+ views · Jan 26, 2025
TK's Garage · YouTube
Car enthusiast
Did the EPA Just Legalize DEF Deletes? Kory Willis & Lawyer Explain
26K+ views · 3 weeks ago
The Diesel Podcast · YouTube
Diesel podcast
DEF crystallization causing problems. Crystallization is a major headache; social media shares products, fixes, and horror stories about white gunk clogging DEF systems.
Crystallization is a major headache; social media shares products, fixes, and horror stories about white gunk clogging DEF systems.
Generative AI is experimental. Learn more
2:59
Crystallization is a major issue with DEF fluid. Rislone tells us about two products to prevent it and CEL’s, limp mode, etc. Full episode available! #dieselpodcast #dieselmechanic #truck #diesel #fyp
220.8K+ views · Sep 11, 2024
The Diesel Podcast · TikTok
Truck podcast
Stop DEF Crystals from Ruining Your System!
33.8K+ views · Sep 25, 2024
The Diesel Podcast · YouTube
Diesel podcast
0:45
DEF Fluid is an Interesting Thing. Amazing Crystals Ruin the Pump System #autoshop #autorepair #enginebuild #enginerepair
2.9M+ views · Sep 17, 2025
Dave's Auto Shop · TikTok
Utah-based automotive repair
Finally a Fix for this DEF Issue!
38.1K+ views · Sep 4, 2024
The Diesel Podcast · YouTube
Diesel podcast
Crystallized exhaust fluid in bottom of trunk.
7 comments · Nov 4, 2025
r/tdi
Reddit
DEF Fluid is an Interesting Thing. Amazing Crystals Ruin the Pump System
951.2K+ views · Sep 17, 2025
Dave's Auto Center · YouTube
Utah-based automotive repair shop
Show 2 more
Web results
AdBlue(AUS32) is essential for next-generation diesel ...
諾瓦材料
https://www.novax-material.com › uploads › files
諾瓦材料
https://www.novax-material.com › uploads › files
PDF
AdBlue (AUS32) consumes the same way as fuel, if it is exhausted, the engine cannot be restarted! AdBlue (AUS32) is an essential SCR system. Urea water is a ...Read more
3 pages
ADBLUE (AUS32) UREA SOLUTION, DIESEL EXHAUST ...
techmation.com
https://www.techmation.com › uploads › 2015/10
techmation.com
https://www.techmation.com › uploads › 2015/10
PDF
As the name AUS32 suggests, AdBlue is made by using urea mixed with demineralised water resulting in a 32.5 % aqueous urea solution. It is colorless, non ...Read more
2 pages
Determination of Trace Elements in Aqueous Urea Solution ...
Agilent Technologies
https://www.agilent.com › library › applications
Agilent Technologies
https://www.agilent.com › library › applications
PDF
Apr 14, 2020 — In this study, an Agilent 5800 radial view (RV) ICP-OES was used to analyze AUS 32 diesel exhaust fluids according to the. ISO-22241 standard ...Read more
5 pages
AUS 32 - Atmosfer Machinery
Atmosfer Makina
https://atmosfermakina.com › adblue
Atmosfer Makina
https://atmosfermakina.com › adblue
AUS32: A 32.5% high-purity urea solution. Function: Acts as a reducing agent for diesel engine vehicles. Emission Reduction: Utilizes Selective Catalytic ...Read more
Diesel Exhaust Fluid (DEF) for Sale - AUS32 Approved
Petroleum Service Company
https://petroleumservicecompany.com › diesel-exhaust-...
Petroleum Service Company
https://petroleumservicecompany.com › diesel-exhaust-...
Diesel Exhaust Fluid (DEF) is a composition of urea and water used in transportation applications to reduce the amount of nitrogen oxides (NOx) emitted into ...Read more
store rating (3.2K)
AUS32 (AdBlue 32,5%) - OCI – Documentation
OCI Global
https://documentation.oci-global.com › 2024/04
OCI Global
https://documentation.oci-global.com › 2024/04
PDF
Persistence and degradability. Readily biodegradable. 12.3. Bioaccumulative potential. AUS32 (AdBlue 32,5%). Partition coefficient n-octanol/water (Log ...Read more
9 pages
High Purity Diesel Engines Additive AdBlue® Urea AUS32 ...
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › Other products
Guangzhou EverBlue Technology Co.,Ltd.
http://www.everbluesolution.com › Other products
AdBlue is mainly composed of 32.5% high - purity urea and 67.5% deionized water. It is a colorless, transparent liquid with a slight ammonia odor.Read more
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