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What is the AdBlue urea solution?


The AdBlue urea solution is used for exhaust gas purification and aftertreatment in diesel engines. What initially only began for trucks and commercial vehicles has now also become standard in modern diesel cars. The reason for this is the EU emission standard Euro-6, which has been in force since 2014. It stipulates that a maximum of 80 grams of nitrogen oxides may escape per 100 km. Modern engines, however, produce more and more nitrogen oxides because they are designed for efficiency and should consume as little fuel as possible. As a result, the fuel-air mixture is becoming "leaner" and warmer. More heat produces more nitrogen oxides.

New catalytic converters have been developed to achieve the low emission values despite the increase in nitrogen oxides. These are so-called SCR catalysts. SCR stands for selective catalytic reduction, which means "selective catalytic reaction". This catalyst primarily reduces nitrogen oxides without the SCR cat consuming more fuel, as is the case with diesel particulate filters, for example. The SCR catalytic converter requires the AdBlue urea solution in order to be able to carry out the exhaust gas aftertreatment effectively.

We offer the original AdBlue urea solutions, certified according to ISO 22241/1 and DIN 70070. At the bottom of the page we present the functionality of AdBlue in more detail, show what to consider when refilling and buying, and provide further useful information on the subject.

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4x 10 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. flexiblem Ausgiesser pro Kanister

item ref.: PKT472W124
manufacturer: BLUESKY
part number: NICHT ZUTREFFEND
EAN-Nr.: 4046934000316
Delivery:

  • 4x Urea Piece
35.95 EUR
0.90 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

3x 10 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. flexiblem Ausgiesser pro Kanister

item ref.: PKT472W123
manufacturer: BLUESKY
part number: NICHT ZUTREFFEND
EAN-Nr.: 4046934000316
Delivery:

  • 3x Urea Piece
26.95 EUR
0.90 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

3x 5 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. Füllschlauch

item ref.: PKT762W147
manufacturer: HOYER
part number: NICHT ZUTREFFEND
EAN-Nr.: 4250007721545
Delivery:

  • 3x Urea Piece
20.95 EUR
1.40 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241 5-Liter

inkl. flexiblem Ausgiesser

item ref.: UNI213W008
manufacturer: HOYER
part number: NICHT ZUTREFFEND
EAN-Nr.: 4250007721545
Baugruppe: Chemische Produkte
Verwendung: Harnstoff
Inhalt_liter: 5
64374267: mit Schlauch
Gebindeart: Flasche
Din_Iso: 22241
Mengeneinheit: Stück
10.00 EUR
2.00 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff 5 L + Befüllschlauch

item ref.: PKT872W320
manufacturer: HOYER
part number: NICHT ZUTREFFEND
EAN-Nr.: 4250007721545
Delivery:

  • 1x Urea Piece
  • 1x Filling Hose Piece
19.95 EUR

incl. legal tax, + shipping fees

available
Add to shopping cart

2x 5 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. Füllschlauch

item ref.: PKT762W146
manufacturer: HOYER
part number: NICHT ZUTREFFEND
EAN-Nr.: 4250007721545
Delivery:

  • 2x Urea Piece
14.95 EUR
1.50 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241 10-Liter

inkl. flexiblem Ausgiesser

item ref.: UNI213W009
manufacturer: BLUESKY
part number: NICHT ZUTREFFEND
EAN-Nr.: 4046934000316
Baugruppe: Chemische Produkte
Verwendung: Harnstoff
64374267: mit Schlauch
Inhalt_liter: 10
Din_Iso: 22241
Gebindeart: Kanister
Mengeneinheit: Stück
10.95 EUR
1.10 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

2x 10 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. flexiblem Ausgiesser pro Kanister

item ref.: PKT472W120
manufacturer: BLUESKY
part number: NICHT ZUTREFFEND
EAN-Nr.: 4046934000316
Delivery:

  • 2x Urea Piece
17.95 EUR
0.90 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

2x 20 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. flexiblem Ausgiesser

item ref.: PKT472W168
manufacturer: HOYER
part number: 76040083
EAN-Nr.: 4250007721538
Delivery:

  • 2x Urea Piece
36.95 EUR
0.92 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241 20-Liter

inkl. flexiblem Ausgiesser

item ref.: UNI213W010
manufacturer: HOYER
part number: 76040083
EAN-Nr.: 4250007721538
Baugruppe: Chemische Produkte
Verwendung: Harnstoff
64374267: mit Schlauch
Inhalt_liter: 20
Din_Iso: 22241
Gebindeart: Kanister
Mengeneinheit: Stück
18.00 EUR
0.90 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

AdBlue® NOX-Reduktionsmittel Harnstoff Refill Kit 3x 1,89 Liter inkl. Adapter

item ref.: UNI213W020
manufacturer: KRUSE
part number: 1003803893500
EAN-Nr.: 4046934000491
Baugruppe: Chemische Produkte
Verwendung: Harnstoff
Gebindeart: Flasche
Inhalt_liter: 1,89
Supplementary Article/Supplementary Info 2: mit Adapter
Din_Iso: 22241
Mengeneinheit: Satz
Menge: 3
21.47 EUR
3.79 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart

4x 5 Liter AdBlue® NOX-Reduktionsmittel für Diesel-Motoren Harnstoff ISO 22241

inkl. Füllschlauch

item ref.: PKT762W148
manufacturer: HOYER
part number: NICHT ZUTREFFEND
EAN-Nr.: 4250007721545
Delivery:

  • 4x Urea Piece
27.95 EUR
1.40 EUR per 1 l

incl. legal tax, + shipping fees

available
Add to shopping cart
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What does the AdBlue urea solution consist of and how does it work?

The AdBlue urea is a registered trademark and is transferred as a license to the producing manufacturers. Only those companies that have successfully undergone various test and quality assurance procedures and meet the prescribed storage and logistics requirements may label their urea solutions with the AdBlue brand. AdBlue consists of 32.5% urea and 67.5% demineralized water. Demineralized water or deionized water, contains no salts as they occur in normal tap water.

Urea is produced from ammonia and carbon dioxide. The ammonia is produced from nitrogen and hydrogen. The AdBlue urea solution releases the ammonia again through the heat in the SCR cat and this converts the nitrogen oxides into harmless nitrogen, carbon dioxide and water vapour. The interaction of the modern SCR cat and the AdBlue urea solution makes it possible to reduce the nitrogen oxide content by up to 90%. Thanks to this exhaust gas purification and exhaust gas aftertreatment, EU exhaust gas standards can be complied with.

The AdBlue urea solution is considered harmless because it has the following properties:

  • Non-combustible
  • Non-explosive
  • Environmentally friendly
  • Biologically degradable
  • Water soluble
  • Colorless

Ammonia in itself is not harmful, but it can cause irritation if it gets into the eyes, respiratory tract and skin. The urea solution should therefore be rinsed off immediately with water if you have come into direct contact with AdBlue. In addition, the ammonia reacts corrosively with some materials. For example, it does not work well with car paint. Here, too, it is important to wipe AdBlue off immediately if something of the urea solution drips onto the paint.

What to consider when refuelling / filling AdBlue?

According to the vehicle manufacturers, diesel drivers do not need to refill the AdBlue urea solution themselves, as one refill should last until the next maintenance interval. However, the average consumption of AdBlue is 5% of diesel consumption. Depending on the size of the AdBlue tank and the driving style, the urea solution may be used up earlier. A warning light in the cockpit will warn you when the urea solution is running low. Then you still have a range of approx. 2,000 kilometres. However, you should not exhaust these, but fill up the AdBlue as soon as possible. If you run out of AdBlue while driving, the engine switches to emergency driving mode and throttles the power. A renewed start of the engine without AdBlue is impossible, because the legislator has installed a so-called environmental immobiliser, because the exhaust cleaning is no longer active. Then at least 5l AdBlue are necessary before the engine starts again.

At most petrol stations there are AdBlue petrol pumps for trucks. However, these are not suitable for refuelling a diesel car. The reasons for this are as follows:

  • The throughput speed of the AdBlue is not designed for cars
  • The automatic refuelling stop of the truck dispensers does not work for passenger cars
  • Overflow can hardly be avoided, which attacks the paint
  • In addition, the nozzle for trucks also does not fit properly on diesel passenger cars

In the meantime there are already individual AdBlue petrol pumps for passenger cars. Otherwise one can fall back also simply to canisters, which give it in building markets, KFZ Shops or supermarkets to buy. Here at the best pay attention to the fact that the canisters have appropriate filler necks.

Since the AdBlue tanks are located differently, the canister size to be chosen is also different. The AdBlue tanks can be located at the following points in the vehicle:

  • In the boot below the cover
  • In the engine compartment
  • Behind the fuel filler flap next to the fuel tank

In the manual of your vehicle you will find the exact location of the AdBlue tank. Smaller bottles / canisters up to 3.5 l are well suited for filling in the trunk and engine compartment. The 4.5l canisters are good for filling through the fuel filler flap. Anything larger should only be used for vans or trucks. The AdBlue urea solution can be filled as it is and should not be stretched or diluted with water. Especially not with normal tap water. The AdBlue must also not be decanted into a canister in which another liquid was previously in it, so that the urea solution is not contaminated and loses its effect.

As soon as the AdBlue tank has been filled, switch on the ignition and wait until the current filling level has been detected by the on-board computer and the warning message is displayed. Then the engine can be started as usual. Checking the fill level can take a few minutes on some vehicles.

It is very important when filling, never fill the AdBlue urea solution into the fuel tank and never fill the diesel into the AdBlue tank. The latter happens very rarely because the filler neck of the diesel does not fit into the AdBlue tank opening, but the other way around it can happen again and again. Once the mishap has happened, the engine should never be started. Then only the tank would be affected, could be cleaned intensively and refilled with diesel. Effort and costs were kept within limits. If, however, the engine is started, the AdBlue does not get into the SCR catalytic converter for exhaust gas cleaning, but into the engine and attacks seals, pipes, etc. The AdBlue is then cleaned by the SCR catalytic converter. Here the damage will be greater and thus also cause higher costs, as the fuel pump, pipes, injection system and filter, among other things, have to be replaced.

As the SCR catalytic converter is precisely matched to the composition of AdBlue, it is strongly discouraged to use other substitutes for exhaust aftertreatment. These may cause damage to the catalytic converter or control unit and generally void the warranty. The AdBlue is also not very expensive. The average price for AdBlue urea solutions is between €1.00 and €3.50 per litre (as of September 2019). With us you receive them already starting from 0,90€ the litre.

What else is there to know about AdBlue?

As the AdBlue urea solution consists of approx. two thirds water, the freezing point of the liquid is -11°C. For this reason, the AdBlue tanks are heated, as are the pipes to the exhaust pipe. In very cold areas it makes sense to put the car in a garage if possible. If the heating of the AdBlue tank breaks down, a warning message will appear and the car should then be brought to the workshop as soon as possible, as the exhaust gas cleaning does not function sufficiently in winter.

The AdBlue does not like higher temperatures very much either, since the urea content decreases when exposed to temperatures above 30°C for longer. The reason for this is ammonia, which evaporates at high temperatures. It is therefore not recommended to carry AdBlue canisters with you in your car. It is best to store them in a cool and dry place.

In summary, with the SCR cat and the AdBlue urea solution it is possible to achieve great effects in exhaust gas purification and to comply with EU exhaust gas standards. Be sure to use the original AdBlue labelled urea solution. Only with this can your vehicle achieve the highest possible performance with the lowest environmental impact. We wish you a pleasant journey at all times.