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    AI Overview
    AdBlue® Guide - What is it & How long does it last? | Crown Oil
    AdBlue® is a non-toxic, 32.5% aqueous urea solution (AUS 32) used in diesel vehicles with Selective Catalytic Reduction (SCR) systems to reduce harmful nitrogen oxide (
    NOxcap N cap O sub x
    𝑁𝑂𝑥
    ) emissions. It is injected into the exhaust, breaking down
    NOxcap N cap O sub x
    𝑁𝑂𝑥
     into nitrogen and water. It is essential for modern diesel engines and cannot be skipped. 
    Key Details About AdBlue® and Urea 
    • Composition: Composed of 32.5% high-purity urea and 67.5% deionized water.
    • Function: It is not a fuel additive, but rather a liquid used in the exhaust system to convert nitrogen oxides (
      NOxcap N cap O sub x
      𝑁𝑂𝑥
      ) into harmless nitrogen and water.
    • Consumption: Typical usage is roughly 5% of diesel fuel consumption, or about 1 liter for every 600 miles (approx. 1000 km).
    • Storage: Stored in a separate dedicated tank, often with a blue cap, and should never be filled into the diesel tank.
    • Vehicle Operation: Modern diesel vehicles will not start if the AdBlue tank is empty. 
    AdBlue® System Issues and Maintenance 
    • Crystallization: The urea can crystallize in lines or dosing valves, causing malfunctions.
    • Preventative Additives: Specialized products like LIQUI MOLY DEF Anti Crystal Additive Concentrate or Kent Urea Anti Crystal Additive are designed to minimize these deposits and prevent breakdowns.
    • System Failure: If the SCR system fails or runs out of fluid, the vehicle may enter "limp-home" mode or refuse to start. 
    Refilling AdBlue® 
    • Availability: Available in bottles or at gas station pumps.
    • Refill interval: Requires a top-up generally every 3,000–4,000 miles (roughly 5,000–6,500 km), though this varies by vehicle. 
    • Diesel exhaust fluid - Wikipedia
      Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue) is a liquid used to reduce the amount of air pol...
      Wikipedia
    • How to protect the exhaust system of modern series diesel ...
      Mar 4, 2026 — The liquid urea solution AdBlue®, also known as diesel exhaust fluid (DEF), is dosed in diesel vehicles with exhaust gas treatment...
      Liqui Moly
    • AdBlue® Fluid - The Facts, the Myths & its Usage
      Before any emissions are released, the solution is sprayed finely into a diesel exhaust at a proportion roughly equal to 5% of the...
      Nationwide Fuels
    Show all
    • Diesel exhaust fluid - Wikipedia
      Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue) is a liquid used to reduce the amount of air pol...
      Wikipedia
    • How to protect the exhaust system of modern series diesel ...
      Mar 4, 2026 — The liquid urea solution AdBlue®, also known as diesel exhaust fluid (DEF), is dosed in diesel vehicles with exhaust gas treatment...
      Liqui Moly
    • AdBlue® Fluid - The Facts, the Myths & its Usage
      Before any emissions are released, the solution is sprayed finely into a diesel exhaust at a proportion roughly equal to 5% of the...
      Nationwide Fuels
    • YouTube
      Oct 26, 2017 — the chemical called ADB blue goes into your diesel engine's exhaust and fewer toxic emissions come out that's what it does. but on...
      8:39
      YouTube·Auto Expert John Cadogan
    • Does ad blue destroy diesel engines? : r/Diesel
      Nov 7, 2023 — AdBlue is a urea/water mix injected into the exhaust. It controls NOx after the fact, meaning they can have higher engine out NOx.
      Reddit
    • HOW to refill AD-BLUE fluid in diesel | What Is It, Who Needs It ...
      Oct 13, 2023 — you fill the AdBlue tank until you see the fluid level at the top of the reservoir. then simply replace the lid. and close the tan...
      38s
      YouTube·Valvoline Global EMEA
    • What is AdBlue? AdBlue Diesel Exhaust - The AA
      Jan 5, 2017 — How much AdBlue does my car use and how long does it last? The rate at which you use AdBlue depends on your engine and how economi...
      The AA
    • Kent Urea Anti Crystal Additive 250ml Bottle - Prevents and Treats Adblue Crystallisation
      Kent Urea Anti Crystal Additive is a concentrated additive that can prevent and treat AdBlue crystallization. It can be used to: *
      Clarkes of Cavan
    • Diesel Exhaust Fluid/AdBlue - Why Your New Diesel May Not ...
      Jan 11, 2025 — and that extra air in the combustion. chamber. can create nitrous oxides and they're very bad for the environment and the catalyst...
      4m
      YouTube·Simmo's Home Workshop
    • What is AdBlue diesel exhaust fluid? - WhichCar
      Jul 8, 2024 — What is AdBlue made from? AdBlue is composed of deionised water (67.5%) and high-purity urea (32.5%).
      WhichCar
    • AdBlue®: What it is and how it works | Motorists - TotalEnergies UK
      Can you drive without AdBlue? It's impossible to drive without AdBlue® – your engine will not start, and you'll see a notification...
      TotalEnergies UK website
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    My Ad Center

    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 is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made ...Read more
    Discussions and forums
    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 is just a urea/water mix injected into the exhaust so that NOx reacts with NH3 over an SCR. I suppose you could have injectors foul ...  More
    Diesel and AdBlue
    Reddit · 
    r/croautomobili
     · 20+ comments
     · 1 year ago
    Diesel and AdBlue
    Reddit · 
    r/croautomobili
     · 20+ comments
     · 1 year ago
    Apparently, this additive reduces the formation of crystals from the remaining AdBlue fluid, and helps prevent these crystals, or whatever they ...  More
    Why does AdBlue only work on Diesel engines?
    Quora · 
    5 answers
     · 2 years ago
    Why does AdBlue only work on Diesel engines?
    Quora · 
    5 answers
     · 2 years ago
    Because there isn’t anywhere near as much NOx coming out of a petrol engine. Petrol engines ...  More
    Top answer · 4 votes · 2 years ago
    Adblue does not work on diesel ENGINES, it works in the EXHAUST of diesel engines. It's ...  More
    2 years ago
    “Why does AdBlue only work on Diesel engines?” AdBlue is needed for the SCR catalytic ...  More
    2 years ago
    See more

    Web results

    AdBlue® Fluid - The Facts, the Myths & its Usage


    Nationwide Fuels
    https://www.nationwidefuels.co.uk › oil-guides › adblu...
    Nationwide Fuels
    https://www.nationwidefuels.co.uk › oil-guides › adblu...
    AdBlue is a highly purified diesel exhaust fluid (DEF) with the official name AUS32 which stands for Aqueous Urea Solution 32.5%.Read more

    Experimental investigation of the effect of urea addition to ...


    ScienceDirect.com
    https://www.sciencedirect.com › article › abs › pii
    ScienceDirect.com
    https://www.sciencedirect.com › article › abs › pii
    by U Demir · 2022 · Cited by 40 — An improvement in emissions and performance was expected by adding urea and its mixtures to diesel fuel. · Engine performance deteriorated with ...Read more

    How to protect the exhaust system of modern series diesel ...


    Liqui Moly
    https://www.liqui-moly.com › Home › Tips and topics
    Liqui Moly
    https://www.liqui-moly.com › Home › Tips and topics
    Mar 4, 2026 — Newer-generation diesel vehicles require urea in addition to fuel. If this is dissolved in demineralized water, an additive is produced, ...Read more
    Free delivery over €25
    Videos
    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
    HOW to refill AD-BLUE fluid in diesel | What Is It, Who Needs It ...
    YouTube · Valvoline Global EMEA
    Oct 13, 2023
    YouTube · Valvoline Global EMEA
    2:10
    Refill AdBlue by parking on a level surface, switching off ignition, and filling the blue-capped reservoir until full with ISO 22241-1 approved fluid.
    Valvoline Global EMEA
    YouTube·
    Oct 13, 2023

    HOW to refill AD-BLUE fluid in diesel | What Is It, Who Needs It ...

    YouTube·Valvoline Global EMEA·Oct 13, 2023
    YouTube
    View all
    Popular products
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    People also ask
    Are DEF and AdBlue the same thing?
    An error has occurred. Please try again later.
    What does AdBlue do to diesel engines?
    AdBlue is a diesel exhaust fluid that works with your vehicle's emission control system to dramatically reduce harmful pollutants. Despite its name suggesting it's blue, AdBlue is actually a clear, colourless liquid composed of high-purity synthetic urea (32.5%) dissolved in demineralised water (67.5%).

    AdBlue Guide for Triton Diesel Owners - Mitsubishi Motors


    Mitsubishi Motors
    https://www.mitsubishi-motors.com.au › what-is-adblue
    Mitsubishi Motors
    https://www.mitsubishi-motors.com.au › what-is-adblue
    Is urea and AdBlue the same thing?
    AdBlue is made from a urea and water solution, which is stored in a separate tank within the vehicle. The urea contains ammonia which reacts with the NOx gas and prevents it from being released into the atmosphere.Feb 25, 2026

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


    RAC
    https://www.rac.co.uk › drive › advice › emissions › adb...
    RAC
    https://www.rac.co.uk › drive › advice › emissions › adb...
    Does a Ford Everest need AdBlue?
    Many new diesel vehicles, including some Ford Everest and Ranger variants, require the use of Diesel Exhaust Fluid commonly referred to as AdBlue®1. It's used to help reduce greenhouse gas emissions while driving.

    What is AdBlue® and Why Does My Ford Have It? | Everest 2022


    Ford Australia
    https://www.ford.com.au › everest › tips-and-tricks › adb...
    Ford Australia
    https://www.ford.com.au › everest › tips-and-tricks › adb...

    Web results

    What Is Adblue® And Why Does It Matter?


    Valvoline™ Global
    https://www.valvolineglobal.com › ... › Articles
    Valvoline™ Global
    https://www.valvolineglobal.com › ... › Articles
    Valvoline AdBlue® is a fully synthetic diesel exhaust fluid made of the highest-quality urea. It is designed to reduce exhaust emissions in systems with the ...Read more

    YouTube


    YouTube · Auto Expert John Cadogan
    352.5K+ views · 8 years ago
    YouTube · Auto Expert John Cadogan
    352.5K+ views · 8 years ago
    8:39
    The chemical called AdBlue goes into your diesel engines exhaust and fewer toxic emissions come out that's what it does.
    6 key moments6 key moments in this video
    From 02:43
    What is AdBlue?
    From 03:30
    What is urea?
    From 05:11
    How does Adblue work?
    From 05:38
    Is any AdBlue compatible with Mercedes?
    From 06:00
    What does Mercedes-Benz say?
    From 06:18
    Can I use non-Mercedes AdBlue?
    Auto Expert John Cadogan
    YouTube·
    Oct 27, 2017

    YouTube

    YouTube·Auto Expert John Cadogan·Oct 27, 2017
    YouTube
    In this video
    • 02:43
      What is AdBlue?
    • 03:30
      What is urea?
    • 05:11
      How does Adblue work?
    • 05:38
      Is any AdBlue compatible with Mercedes?
    • 06:00
      What does Mercedes-Benz say?
    • 06:18
      Can I use non-Mercedes AdBlue?

    High-purity urea solution Diesel exhaust fluid DEF filled in ...


    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › Other products
    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › Other products
    The urea solution for vehicles is a non-flammable, non-explosive and non-toxic solution with extremely low transportation risk.Read more

    AdBlue Additive


    TecLub | Technical Lubricants International B.V.
    https://www.teclub.com › shop › diesel-system-treatments
    TecLub | Technical Lubricants International B.V.
    https://www.teclub.com › shop › diesel-system-treatments
    One 250 ml dosing bottle treats 100 L of urea fluid such as AdBlue®, AUS32 , Diesel Exhaust Fluid (DEF) . Use 25 ml for each 10 L of urea fluid. Do not overdose ...Read more
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