Hype Flex
news | August 23, 2026

Is DEF AD BLUE?

WHAT IS DIESEL EXHAUST FLUID/AdBlue. Diesel Exhaust Fluid (DEF) also known as AdBlue®, is a non-toxic, colourless, odourless and non-flammable fluid. Stored in a dedicated tank in your car, it is injected into the exhaust system to clean exhaust gases.

Is AdBlue the same as DEF?

Here's the short answer: AdBlue and Blue DEF are generally the same stuff, they are simply different brands of DEF. AdBlue and Blue DEF are just trademarked names used by two different companies to market diesel exhaust fluid or DEF and so they are quite similar with little differences.

Is DEF actually blue?

In addition, the filling cap for the DEF tank is blue and will be clearly marked 'Diesel Exhaust Fluid' with the accompanying ISO standard number. However, a small number of cases have been reported where diesel has been put in the DEF tank.

Is AdBlue actually blue?

AdBlue is a colourless, non-toxic mixture of urea and de-ionised water. It's not actually blue at all. Lots of people think AdBlue is made of pig urine – it's not. The urea used in AdBlue is a high purity man-made solution – pig urine wouldn't be pure or sterile enough for a commercial product.

Is DEF clear or blue?

DEF is a clear, colorless liquid. How much does DEF weigh? DEF weighs approximately 9 lbs per gallon. Compared to diesel fuel at approx 7.05 lbs and gasoline at an average of 6.19 lbs, DEF is a relatively heavy product.

35 related questions found

Will DEF freeze in my truck?

Diesel Exhaust Fluid or DEF Fluid

Whether in storage tanks or in equipment, DEF can freeze and possibly cause issues. As temperatures drop below 12°F, DEF will begin to solidify and not work as intended.

Is all diesel DEF the same?

DEF features

The main component that sets brands of DEF apart from each other is the level of purity in the product. 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.

Can I refill AdBlue myself?

Can I top up with AdBlue® myself? Yes, you can top up with AdBlue® yourself. Every TotalEnergies service station sells standard 5L and 10L cans of AdBlue®. TotalEnergies is also gradually deploying special pumps for light vehicles.

Are there different types 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.

Do all diesel cars need AdBlue?

Does every diesel need AdBlue? AdBlue should only be used in diesel cars fitted with an SCR system, so if in doubt, consult the vehicle handbook. As a rule of thumb, the more recently the diesel car was built, the more likely it is to use AdBlue, as the Euro 6 regulations were introduced in 2014.

Can you run a diesel without DEF?

Can You Run A Diesel Engine Without Def? There is no way modern trucks will run without DEF. Drivers of diesel trucks therefore need to check their fluid levels frequently in order to make sure they're as good as possible. It is everyone's responsibility to reduce emissions.

How do you check a BlueDEF date?

A: For BlueDef, there will be a 2-letter mfg plant code, followed by a 2-digit "one year old year" (if made in 2019, it would show "20"), followed by a 3-digit "reverse day of year" (if made Jan 10th, it would show "355", Dec 21 would be "010").).

Can you mix different brands of Def fluid?

Registered. I've mixed different brand of DEF and never had an issue. Just make sure it meets the required specs.

Do European diesel vehicles use DEF?

The fluid used in these systems is known as AdBlue or DEF (Diesel Exhaust Fluid), and the use is widespread in diesel cars and trucks today. The charge by the EU is that the German automakers agreed to limit the size of the DEF tanks in cars.

Where do you add blue def?

You can typically locate the opening for adding it right beside your diesel tank entry point. Sometimes, especially in older cars and trucks, it may be located somewhere in the passenger space, trunk, or inside the engine compartment.

Is there only one type of AdBlue?

No, there are several different types of AdBlue. These are differentiated by International Organisation for Standardisation (ISO) 22241 numbers. Modern diesel cars run on ISO-22241-1, ISO-22241-2 or ISO-22241-3. Make sure you check your vehicle handbook to find out which type your car needs.

Is AdBlue a 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.

What is the blue additive for diesel?

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 much AdBlue do I put in?

How much AdBlue® does my car need? It is difficult to say exactly how much AbBlue® your car needs as models differ, but usage generally equates to around 1 litre per 350 to 600 miles. AdBlue® use is also usually around 3 to 6% of diesel consumption.

Can you buy AdBlue from 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.

What happens if I run out of AdBlue?

If you run out of AdBlue™, your vehicle will not re-start after you turn off the engine – this is a condition of the EU6 emissions legislation and applies to all types of vehicles. The AdBlue™ tank will need to be refilled with a minimum of approximately 3-5 litres of AdBlue™ before the vehicle will start.

Can you pee in your DEF tank?

Please do not urinate in your DEF tank, the SCR system will be damaged and it will cost thousands of dollars to repair.

Is Blue Sky DEF good?

Since 2010, Blue Sky has been providing the highest quality diesel exhaust fluid to satisfied customers throughout North America. Whether in vehicles large or small, on- or off-road, Blue Sky DEF is a trusted and environmentally responsible emission-control solution for diesel-powered engine operators everywhere.

Who makes Blue def fluid?

Such complex systems are bound to require repairs, but family-owned automotive aftermarket company Old World Industries, the manufacturer of leading brands such as BlueDEF® and PEAK®, is sharing several insights to ensure your diesel exhaust system runs smoothly to avoid insanely expensive repairs.