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    AI Overview
    AdBlue (DEF) diesel exhaust fluid (ISO 22241) AUS 32 - Petropec
    AdBlue, also known as Diesel Exhaust Fluid (DEF) or AUS 32, is a 32.5% urea and 67.5% deionized water solution used in modern diesel vehicles with Selective Catalytic Reduction (SCR) systems. It breaks down harmful nitrogen oxide (
    NOxcap N cap O sub x
    𝑁𝑂𝑥
    ) emissions into nitrogen and water vapor. It is stored in a separate tank and is not mixed with diesel fuel. 
    Key Details on AdBlue/DEF: 
    • Function: Injected into the exhaust stream, it reacts with the catalytic converter to reduce
      NOxcap N cap O sub x
      𝑁𝑂𝑥
      emissions, allowing engines to meet strict Euro 6 and other global emissions standards.
    • Usage Rate: Typically, it is used at a rate of roughly 5% of diesel consumption (e.g., 5 liters of AdBlue for every 100 liters of diesel).
    • Warning: Modern diesel cars will not start if the AdBlue tank is empty, often providing warnings before an engine lockout.
    • Storage & Handling: It is not a fuel additive and should never be placed in the diesel tank. It can freeze at
      −11∘
      𝐶
      (
      12∘
      𝐹
      ) and has a limited shelf life.
    • Quality Requirement: Only use ISO 22241 standard fluid. Poor quality, contaminated, or improper DEF solutions can lead to expensive repairs ($300–$3000) of components like the injector, SCR catalyst, and
      NOxcap N cap O sub x
      𝑁𝑂𝑥
      sensors.
    • Maintenance: On Reddit, some users noted that AdBlue systems can be prone to crystallization. 
    Common Uses: 
    • Trucking/Commercial: Large fleets use AdBlue for emissions compliance.
    • Modern Diesel Passenger Cars: Often branded as BlueHDi (PSA/Peugeot/Citroen) or BlueTec (Daimler). 
    If you run out of AdBlue while driving, the engine will not shut down, but once turned off, it will not restart until the tank is refilled. 
    • What is AdBlue? Q&A on DEF Confusion - Unity Fuel Solutions
      Aug 19, 2024 — Large trucking companies can use AdBlue across their entire national fleets. The common requirement among all vehicles that use Ad...
      Unity Fuel Solutions
    • How DPF & Adblue (DEF) Work In Diesel Engine?
      Nov 12, 2024 — how does a DPF work in diesel engines diesel engines are known for their power fuel efficiency and longevity. but with all that po...
      2:30
      YouTube·Supercharged Petrolhead
    • Diesel exhaust fluid - Wikipedia
      In the international standard defining DEF (ISO 22241), it is referred to as AUS 32 (aqueous urea solution 32%). DEF is also sold ...
      Wikipedia
    • What even is Adblue? : r/DieselTechs - Reddit
      Feb 20, 2024 — System Reliability Concerns: The Adblue/DEF system is noted to be prone to issues such as crystallization on sensors and failures ...
      Reddit
    • Diesel Owners: Learn This About AdBlue/DEF Before It's Too ...
      Jan 16, 2026 — your diesel car has a secret second fuel tank that you're constantly refilling. and nobody told you about the hidden costs failure...
      8:16
      YouTube·Car Expertly
    • AdBlue® Urea Diesel Exhaust Fluid (DEF) 10 Liter
      AdBlue® is widely available from main dealers and independent garages, as well as accessory shops and chains. It's a comsuable of ...
      Guangzhou EverBlue Technology Co.,Ltd.
    Show all
    • What is AdBlue? Q&A on DEF Confusion - Unity Fuel Solutions
      Aug 19, 2024 — Large trucking companies can use AdBlue across their entire national fleets. The common requirement among all vehicles that use Ad...
      Unity Fuel Solutions
    • How DPF & Adblue (DEF) Work In Diesel Engine?
      Nov 12, 2024 — how does a DPF work in diesel engines diesel engines are known for their power fuel efficiency and longevity. but with all that po...
      2:30
      YouTube·Supercharged Petrolhead
    • Diesel exhaust fluid - Wikipedia
      In the international standard defining DEF (ISO 22241), it is referred to as AUS 32 (aqueous urea solution 32%). DEF is also sold ...
      Wikipedia
    • What even is Adblue? : r/DieselTechs - Reddit
      Feb 20, 2024 — System Reliability Concerns: The Adblue/DEF system is noted to be prone to issues such as crystallization on sensors and failures ...
      Reddit
    • Diesel Owners: Learn This About AdBlue/DEF Before It's Too ...
      Jan 16, 2026 — your diesel car has a secret second fuel tank that you're constantly refilling. and nobody told you about the hidden costs failure...
      8:16
      YouTube·Car Expertly
    • AdBlue® Urea Diesel Exhaust Fluid (DEF) 10 Liter
      AdBlue® is widely available from main dealers and independent garages, as well as accessory shops and chains. It's a comsuable of ...
      Guangzhou EverBlue Technology Co.,Ltd.
    • What is AdBlue? Diesel Exhaust Fluid (DEF) - Explained
      Apr 24, 2026 — How does AdBlue reduce exhaust emissions? The AdBlue fluid enters a vehicle's exhaust system, where the aqueous urea is converted ...
      StartRescue
    • What is AdBlue? Why does your car need it? | RAC Drive
      Feb 25, 2026 — If you don't use AdBlue, your car's diesel engine will not be able to meet the latest emissions standards. Without AdBlue, the eng...
      RAC
    • Understanding AdBlue: The Key to Efficient DEF Usage
      AdBlue, also known as Diesel Exhaust Fluid (DEF), has become an essential solution in reducing harmful emissions in diesel engines...
      Atmosfer Makina
    • AdBlue® Guide - What is it & How long does it last? - Crown Oil
      Why use AdBlue® that meets the specifications? Using the diesel exhaust fluid that meets specifications is essential because low-g...
      Crown Oil
    • What is Adblue®?| Diesel Exhaust Fluid for Emissions - Yara
      Nov 11, 2025 — Frequently Asked Questions. What exactly does AdBlue do? AdBlue helps the SCR system turn harmful nitrogen oxides (NOx) into harml...
      Yara
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    My Ad Center
    Videos
    Diesel Owners: Learn This About AdBlue/DEF Before It's Too ...
    YouTube · Car Expertly
    Jan 16, 2026
    YouTube · Car Expertly
    8:16
    Learn about AdBlue/DEF hidden costs, failures, and frustrations, including $2k-$4k SCR catalyst replacement & early warning signs.
    Car Expertly
    YouTube·
    Jan 16, 2026

    Diesel Owners: Learn This About AdBlue/DEF Before It's Too ...

    YouTube·Car Expertly·Jan 16, 2026
    YouTube
    The AdBlue you should use to prevent a breakdown.
    YouTube · ADVANCED FLEET MANAGEMENT TUBE
    2 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
    Diesel Exhaust Fluid/AdBlue - Why Your New Diesel May Not ...
    YouTube · Simmo's Home Workshop
    Jan 11, 2025
    YouTube · Simmo's Home Workshop
    8:26
    AdBlue, or DEF, is 67.5% deionized water and 32.5% urea. Vehicles won't run without it to meet Euro 6 emissions.
    Simmo's Home Workshop
    YouTube·
    Jan 11, 2025

    Diesel Exhaust Fluid/AdBlue - Why Your New Diesel May Not ...

    YouTube·Simmo's Home Workshop·Jan 11, 2025
    YouTube
    In this video
    • 00:00
      Introduction
    • 00:15
      Diesel emission controls Euro 6
    • 00:55
      Why do we need AdBlue / DEF?
    • 01:25
      How a catalytic converter / D.O.C works
    • 02:07
      How a DPF works / regeneration
    • 03:50
      AdBlue / Diesel Exhaust Fluid
    • 04:25
      How AdBlue works
    • 05:03
      How much AdBlue do I need?
    • 05:40
      What happens if I run out of AdBlue?
    • 06:40
      Drawbacks of AdBlue / Diesel Exhaust Fluid

    View all
    People also ask
    Are DEF and AdBlue the same thing?
    An error has occurred. Please try again later.
    Can I use pee instead of DEF?
    An error has occurred. Please try again later.
    What does AdBlue do for diesels?
    AdBlue is a urea-based solution that is used to reduce the amount of harmful nitrogen oxides (NOx) emitted from diesel engine exhaust. AdBlue is injected into the exhaust stream of diesel engines to reduce the amount of NOx emitted, helping them to meet emissions regulations.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
    How much does it cost to refill AdBlue?
    At your local National branch, you can refill your AdBlue, up to 10L for a price of £27.99. If additional litres are required, there may be an added charge.

    AdBlue fuel additive Top-up - National Tyres


    National Tyres
    https://www.national.co.uk › adblue
    National Tyres
    https://www.national.co.uk › adblue
    Discussions and forums
    What even is Adblue?
    Reddit · 
    r/DieselTechs
     · 30+ comments
     · 2 years ago
    What even is Adblue?
    Reddit · 
    r/DieselTechs
     · 30+ comments
     · 2 years ago
    It's DEF (Diesel Exhaust Fluid)  More
    Top answer · 47 votes · 2 years ago
    DEF... but that's specific as hell.  More
    23 votes · 2 years ago
    It's DEF  More
    18 votes · 2 years ago
    What is AdBlue, and why is it important for modern diesel trucks? How do ...
    Quora · 
    3 answers
     · 5 months ago
    What is AdBlue, and why is it important for modern diesel trucks? How do ...
    Quora · 
    3 answers
     · 5 months ago
    A brand of diesel exhaust fluid. DEF is a ammonia and water based liquid that when sprayed ...  More
    Top answer · 5 months ago
    Sounds like a new type of DEF according to what I see online, it is a DEF alternative ...  More
    5 months ago
    Does ad blue destroy diesel engines?
    Reddit · 
    r/Diesel
     · 20+ comments
     · 2 years ago
    Does ad blue destroy diesel engines?
    Reddit · 
    r/Diesel
     · 20+ comments
     · 2 years ago
    Ad blue only affects exhaust. It has nothing to do with the engine.  More

    See more

    Web results

    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
    Popular products
    • Bluedef Diesel Exhaust Fluid.
      Bluedef Diesel Exhaust Fluid
      $15.48
      Home Depot
       & more
      Free delivery by Wed
      4.6(3K)
      Bluedef Diesel Exhaust Fluid
      $15.48
      Home Depot
       & more
      Free delivery by Wed
      4.6(3K)
    • Supertech Diesel Exhaust Fluid 2.5 Gallons 12 Pack.
      Supertech Diesel Exhaust Fluid 2.5 Gallons 12 Pack
      $8.88
      Walmart
      4.2(659)
      Supertech Diesel Exhaust Fluid 2.5 Gallons 12 Pack
      $8.88
      Walmart
      4.2(659)
    • BlueDEF Platinum Diesel Exhaust Fluid 2.5 gal deg002.
      BlueDEF Platinum Diesel Exhaust Fluid 2.5 gal deg002
      $22.68
      Lowe's
       & more
      4.4(803)
      BlueDEF Platinum Diesel Exhaust Fluid 2.5 gal deg002
      $22.68
      Lowe's
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      4.4(803)
    • AdBlue DEF Half Gallon.
      AdBlue DEF Half Gallon
      $35.95
      IDParts.com
      3.7(3)
      AdBlue DEF Half Gallon
      $35.95
      IDParts.com
      3.7(3)
    • Audi AdBlue Diesel Exhaust Fluid.
      Audi AdBlue Diesel Exhaust Fluid
      $25.85
      getAudiparts.com
      Free delivery on $499+
      Audi AdBlue Diesel Exhaust Fluid
      $25.85
      getAudiparts.com
      Free delivery on $499+
    • G0529101LPDC - Genuine Volkswagen Audi AdBlue DEF Fluid - 1 Liter: Diesel exhaust fluid for BMW, Audi, Mercedes Benz, VW.
      G0529101LPDC - Genuine Volkswagen Audi AdBlue DEF Fluid - 1 Liter: Diesel exhaust fluid for BMW, Audi, Mercedes Benz, VW
      $3.62
      ECS Tuning
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      G0529101LPDC - Genuine Volkswagen Audi AdBlue DEF Fluid - 1 Liter: Diesel exhaust fluid for BMW, Audi, Mercedes Benz, VW
      $3.62
      ECS Tuning
      4.6(17)
    • Genuine Volkswagen Audi AdBlue DEF Fluid - 9.46 Liters: For BMW enthusiasts committed to optimizing their vehicle's performance, the ....
      Genuine Volkswagen Audi AdBlue DEF Fluid - 9.46 Liters: For BMW enthusiasts committed to optimizing their vehicle's performance, the ...
      $34.86
      Turner Motorsport
      Genuine Volkswagen Audi AdBlue DEF Fluid - 9.46 Liters: For BMW enthusiasts committed to optimizing their vehicle's performance, the ...
      $34.86
      Turner Motorsport
    • Rislone Diesel DEF Treatment Super Concentrate.
      Rislone Diesel DEF Treatment Super Concentrate
      $45.30
      Walmart
       & more
      Free delivery
      Rislone Diesel DEF Treatment Super Concentrate
      $45.30
      Walmart
       & more
      Free delivery

    Web results

    Adblue Diesel Exhaust Fluid


    Amazon.com
    https://www.amazon.com › adblue-diesel-exhaust-fluid
    Amazon.com
    https://www.amazon.com › adblue-diesel-exhaust-fluid
    AdBlue Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment, Bulk 2.6-Gallon / 10L Container, Compatible with Land Rover Discovery 5, Range Rover Sport ...Read more
    4.5 store rating (11K) · 30-day returns

    AdBlue® Urea Diesel Exhaust Fluid (DEF) 10 Liter


    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › Other products
    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › Other products
    AdBlue is a liquid solution used by some diesel engines with selective catalytic reduction (SCR) to lower nitrogen oxide (NOx) emissions.Read more

    What is AdBlue? Q&A on DEF Confusion


    Unity Fuel Solutions
    https://unityfuel.com › blog › adblue
    Unity Fuel Solutions
    https://unityfuel.com › blog › adblue
    Aug 19, 2024 — AdBlue works with CSR systems to reduce NOX emissions and meet EPA requirements. (Europe has its own regulations for diesel engine vehicles ...Read more
  • Q: What is AdBlue?
  • Q: What does AdBlue do?
  • Q: Is AdBlue more of a...
  • What Is AdBlue? - Diesel Exhaust Fluid Function


    YouTube · Car Cure
    660+ views · 4 months ago
    YouTube · Car Cure
    660+ views · 4 months ago
    2:02
    adlue is a trade name for diesel exhaust fluid a precise mixture consisting of 32.5% high purity ura and 67.5% deionized water.
    Car Cure
    YouTube·
    Dec 25, 2025

    What Is AdBlue? - Diesel Exhaust Fluid Function

    YouTube·Car Cure·Dec 25, 2025
    YouTube

    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 a diesel exhaust fluid that is used in vehicles to meet strict Euro 6 emission regulations. Millions of diesel cars and vans use AdBlue.Read more

    Adblue vs Blue Def


    TDIClub Forums
    https://forums.tdiclub.com › ... › TDI 101
    TDIClub Forums
    https://forums.tdiclub.com › ... › TDI 101
    Adblue and DEF are one and the same. Brand doesn't matter. DEF is made to an ISO standard (ISO 22241) and is a commodity item and used worldwide.Read more
    More products
    • PEAK Diesel Exhaust Fluid.
      PEAK Diesel Exhaust Fluid
      $12.99
      Ace Hardware
       & more
      4.0(29)
      PEAK Diesel Exhaust Fluid
      $12.99
      Ace Hardware
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    • 17% OFF
      BMW SCR Diesel Exhaust Fluid. 17% OFF.
      BMW SCR Diesel Exhaust Fluid
      $21.59$26
      getBMWparts.com
       & more
      Free delivery on $499+
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      17% OFF
      BMW SCR Diesel Exhaust Fluid
      $21.59$26
      getBMWparts.com
       & more
      Free delivery on $499+
      4.9(35)
    • Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment By AdBlue, Half Gallon (1.89-Liter), For Land Rover Discovery 5, Range Rover Sport, Velar, ..
      Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment By AdBlue, Half Gallon (1.89-Liter), For Land Rover Discovery 5, Range Rover Sport, Velar, .
      $19.95
      Atlantic British
      3.7(3)
      Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment By AdBlue, Half Gallon (1.89-Liter), For Land Rover Discovery 5, Range Rover Sport, Velar, .
      $19.95
      Atlantic British
      3.7(3)
    • Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner.
      Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner
      $24.99
      AutoZone
       & more
      4.0(157)
      Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner
      $24.99
      AutoZone
       & more
      4.0(157)
    • 0005830107 - Genuine Mercedes Benz AdBlue DEF Fluid - 2.0 Liter: Featuring Square Bottle Diesel exhaust fluid for Mercedes Benz.
      0005830107 - Genuine Mercedes Benz AdBlue DEF Fluid - 2.0 Liter: Featuring Square Bottle Diesel exhaust fluid for Mercedes Benz
      $24.35
      ECS Tuning
      5.0(2)
      0005830107 - Genuine Mercedes Benz AdBlue DEF Fluid - 2.0 Liter: Featuring Square Bottle Diesel exhaust fluid for Mercedes Benz
      $24.35
      ECS Tuning
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    • ULINE Peak BlueDEF Diesel Exhaust Fluid.
      ULINE Peak BlueDEF Diesel Exhaust Fluid
      $20.00
      ULINE
      ULINE Peak BlueDEF Diesel Exhaust Fluid
      $20.00
      ULINE
    • Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment By AdBlue, Two Half Gallon Bottles (1 Gallon / 3.78-Liters Total), For Land Rover Discovery .
      Diesel Exhaust Fluid DEF SCR LR072258, Original Equipment By AdBlue, Two Half Gallon Bottles (1 Gallon / 3.78-Liters Total), For Land Rover Discovery
      $37.95
      Atlantic British
      3.7(3)
      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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    • 13% OFF
      Adblue Diesel Exhaust Fluid DEF SCR Lr072258, Original Equipment, Bulk 2.6-Gallon / 10L Container, Compatible with Land Rover Discovery 5, Range Rover. 13% OFF.
      Adblue Diesel Exhaust Fluid DEF SCR Lr072258, Original Equipment, Bulk 2.6-Gallon / 10L Container, Compatible with Land Rover Discovery 5, Range Rover
      $59.95$69
      Walmart - LighterFFire
      Free delivery
      13% OFF
      Adblue Diesel Exhaust Fluid DEF SCR Lr072258, Original Equipment, Bulk 2.6-Gallon / 10L Container, Compatible with Land Rover Discovery 5, Range Rover
      $59.95$69
      Walmart - LighterFFire
      Free delivery

    Web results

    AdBlue DEF Half Gallon 83190441139


    IDParts.com
    https://www.idparts.com › ... › Diesel Exhaust Fluid
    IDParts.com
    https://www.idparts.com › ... › Diesel Exhaust Fluid
    NOx-reducing agent for diesel engines with SCR-exhaust gas after treatment. This fluid is used in the 2012 Passat TDI, all V6 Touareg TDI, all Q7 TDI.
    $35.95 · 5.0(20) · $9.95 delivery · 30-day returns
    People also search for
    Adblue def for diesel engine cost
    Why is DEF bad for diesel engines
    AdBlue DEF fluid
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    What is DEF for diesel
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