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The Daily Insight

Can you use urine instead of AdBlue?

Author

Daniel Martin

Updated on March 25, 2026

But sadly, the answer is "no". A modern clean diesel car will recognize that your pee is not the right stuff. AdBlue solution has a far higher concentration of urea--32.5%--mixed into deionized water. If you put in the wrong stuff, from pure water to windshield washer fluid to human urine, the car won't run.

Correspondingly, can you bypass AdBlue?

AdBlue Solution

Without Adblue, newer vehicles will lack power significantly and have multiple warning messages on the display unit, this module is designed so that you can bypass all of this.

Also Know, can you replace AdBlue with water? No it's not a myth. Adblue is a useless addition. It just sprays the fumes in the exhaust to cool them down. Water does exactly the same thing.

Subsequently, one may also ask, can I use any type of AdBlue?

AdBlue is a proprietary name, like Hoover and iPhone: i.e. there are not different types or brands of AdBlue, though there may at any time be different brands selling other urea-based solutions that perform the same function. AdBlue is stored in a tank in the vehicle, and is injected into the SCR system as required.

What can I use instead of DEF fluid?

Windshield washer fluid that contains ammonia will do in a pinch. It contains less AA than needed but will get you to a town where you can get DEF.

Related Question Answers

What happens if no AdBlue?

What happens if I run out of AdBlue? If you run out of AdBlue while you're driving, then the engine's power and performance will be reduced to limit its emissions. Once you've stopped, you won't be able to restart the engine if the AdBlue tank's empty.

How do I know when AdBlue tank is full?

Most vehicles with AdBlue will have a gauge of how full the tank is buried somewhere in the car's infotainment. Keep searching until you find it, and you'll know how much AdBlue you need.

What AdBlue delete?

AdBlue (SCR) Removal

The AdBlue fluid (urea and demineralized water) is injected into the exhaust system just before the SCR catalyst. Our AdBlue delete service will electronically disable the AdBlue system along with removing the associated dashboard lights and warning messages.

Is all AdBlue the same quality?

While there are different names for AdBlue®, such as Bluedef, BlueTec and so forth, all mixes should contain the same solution of 32.5% urea and 67.5% de-ionised water. The German Association of the Automotive Industry's AdBlue® marque can be confidently relied upon to meet these requirements, while others may not.

Is AdBlue clear?

AdBlue® is a 32.5% solution of high-purity urea in de-mineralized water that is clear, non-toxic and safe to handle and is not harmful to the environment. AdBlue® is neither a fuel nor a fuel additive and has its own dedicated tank.

Is AdBlue a legal requirement?

As it is a legal requirement that all diesel emissions must meet the Euro 6 limits, every time you burn any fuel you will be outputting fumes, and therefore AdBlue will be used.

Is a def delete illegal?

In the U.S., the EPA Clean Air Act prohibits anyone from tampering with an emission control device on a motor vehicle by removing it or making it inoperable. Canada has essentially the same law under a different name, the Canadian Environmental Protection Act. DEF tampering is illegal, yet it happens.

How do I reset my Mercedes AdBlue warning?

Mercedes Adblue Reset
  1. Turn ignition on once.
  2. Press and hold the gas pedal. Keep the gas pedal pressed until the glow plug comes back on.
  3. Wait for the glow plug light to stop blinking. Then turn off the ignition.
  4. Wait 10 seconds with the ignition off.
  5. Turn the ignition back on.
  6. Press the gas pedal two times.

Is AdBlue made from pigs urine?

Is AdBlue® made from pigs' urine? AdBlue® is a synthetic, highly purified solution of urea and demineralized water NOT pigs urine. Whilst the chemical urea is in pigs' urine, it is found in much lower concentration alongside many other elements.

Can I refill AdBlue myself?

Garages should refill AdBlue as part of a diesel car's routine servicing. However, it's possible to refill a tank of AdBlue yourself. Some service stations have AdBlue dispensing pumps.

Do all diesel cars need AdBlue?

Many diesel cars registered after September 2015 use AdBlue to reduce emissions. In general, if you own a Euro 6-compliant diesel Audi, BMW, Citroën, Jaguar, Land Rover, Mercedes-Benz or Peugeot, it's likely to use AdBlue technology. There's often a clue in the car's model name, which may have 'Blue' or 'SCR' in it.

Can I put AdBlue in my diesel tank?

AdBlue is commonly mistaken as a fuel additive when it is actually an exhaust fluid that should never be mixed with diesel. AdBlue has its own tank and is stored completely separately to your vehicle's fuel. Adding AdBlue into your diesel fuel tank can cause thousands of pounds worth of damage.

Can I buy AdBlue at petrol stations?

You can find portable containers of AdBlue in the majority of filling stations, at the majority of appropriate retailers and the big branded online platforms too.

How much AdBlue do I put in?

AdBlue is consumed in proportion to engine usage. It is estimated that a passenger car will consume approximately 1.5 litres of AdBlue for every 620 miles. The size of AdBlue tanks vary, too, so when you need to top up depends on your driving style, the number of miles you cover, and the size of the tank.

Can AdBlue freeze?

Can Adblue Freeze? AdBlue does freeze, but the freezing temperature is -11°C, and it won't begin to freeze until -10°C.

How do I check my AdBlue level?

Checking AdBlue level

Open the Car status app in the app view. Press Status to show the AdBlue level. Graphic for AdBlue level in the centre display. Each cursor represents approx.

How big is an AdBlue tank?

1,000 litres

Why is AdBlue not blue?

AdBlue is not actually blue at all, but is a colourless, non-toxic mixture of urea and de-ionised water. It's an exhaust fluid – not a fuel additive – and is stored in a separate reservoir topped up via a (usually) blue filler cap located either next to the fuel filler, in the boot or under the bonnet.

Can I reuse an AdBlue containers?

DON'T use fuel or lubricants equipment such as funnels, jugs or containers, for AdBlue® storage or dispensing as it will contaminate your AdBlue®. DON'T refill previously used AdBlue® containers as they may have been contaminated.

How long does AdBlue last once opened?

a 2 year

What does AdBlue do to diesel engines?

AdBlue is a non-toxic diesel exhaust fluid, made up of high purity urea and deionized water used to treat exhausts on diesel engines to reduce harmful emissions. Although it's odorless and non-toxic, it can corrode metallic surfaces.

How do you dissolve AdBlue?

The urea crystals are easy to dissolve in water, so the automotive urea needs to avoid the contact with dry air, especially at the Adblue injection valve and exhaust pipe. At 100~130 degrees centigrade, the water of the Adblue solution evaporates very quickly.

Can you pee in your DEF tank?

But sadly, the answer is "no". A modern clean diesel car will recognize that your pee is not the right stuff. AdBlue solution has a far higher concentration of urea--32.5%--mixed into deionized water. If you put in the wrong stuff, from pure water to windshield washer fluid to human urine, the car won't run.

What happens if you dont use def?

If you ignore the DEF warning the truck will cease to work. Some diesel engine manufacturers allow the engine to go into reduced power mode so the truck can “limp home” or limit the number of times you can turn the engine over.

What happens if u run out of DEF fluid?

In addition, they are equipped with a system of flashing lights to alert the operator well in advance when the DEF tank is getting low on fluid. If the reservoir is not replenished with DEF and runs low, vehicle speed will be limited, but as soon as DEF is added, the engine will resume normal speed levels.

Can you drive without def?

Drivers need to be vigilant when it comes to DEF, so that they don't lose time, damage their vehicles, and end up in big trouble with their employer. Ignoring the DEF light is never a good idea, so if it comes on, the driver should pull over and have their DEF refilled immediately.

Is deleting a diesel good?

Removing the DEF components is just one step in what those in the performance-diesel circles call doing a “delete.” Emissions-related components on diesels are there to reduce the amount of harmful nitrogen oxides (NOx) and exhaust particulates released into the air.

Why is def so expensive?

As the prices for raw materials used in the manufacture of DEF – primarily urea – rise and fall, increases in cost are felt along the entirety of the supply chain, eventually absorbed by the end user.

How far can you drive with Def light on?

According to the owner's manual, a full DEF tank should last 6300 miles, but, as everyone knows by now, your mileage will vary.

Is all DEF fluid the same?

DEF fluids all must meet an international standard and standards from the EPA that measure the purity of this fluid. Only purchase a DEF that meets the ISO 22241 standard. Sometimes, inexpensive bottles of fluid may claim to be DEF-compatible. However, if they don't also meet the ISO 22241 standard, they are not DEF.

Can you make your own def fluid?

DEF is 32.5 percent high purity urea and 67.5 percent demineralized water. But don't think you can save some money and make your own DEF. Agricultural grade urea or UAN (urea ammonium nitrate) should never be used in place of DEF.