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Czech (Čeština)

So, RUNWELL rent a car company has some cars with Diesel  and AdBlue, and our clients have to use it together. 

What is AdBlue?

AdBlue is a solution made up of urea and water that’s injected into the car’s exhaust system before NOx leaves your exhaust. After it’s fed into the exhaust, it reacts with the NOx produced by the combustion process, and breaks it down into harmless nitrogen and oxygen.


It’s a case of basic chemistry – at high temperatures, AdBlue turns into ammonia, and it’s this process that breaks down the NOx. And this significantly reduces the amount of NOx particles in exhaust emissions.

 This process is managed by a Selective Catalytic Reduction (SCR) system. In a nutshell, AdBlue is injected through a catalyst in the exhaust. 

When do I need to top up AdBlue?
Your car will tell you. When it’s running low and you get a warning flash up on your dashboard – you’ll get plenty of notice before it becomes an issue, but fail to top it up, and there will be consequences.

Where can I buy AdBlue?
It’s getting more common. You’ll be able to get top-up bottles of AdBlue through petrol stations. It’s a simple process, like topping up with screenwash.

The location of the filler cap varies between cars. In some it’s located next to the fuel filler cap, while others are at the side of the boot or under the boot floor. Again, find this out before you get close to running out so there aren’t any surprises when you come to top up.

What happens if I run out of AdBlue?
Your car’s engine management system won’t stop the car, but when your AdBlue has run out, it will leave it not being able to start. You’d be pretty unlucky (and careless) if you ran out of AdBlue, because most cars will warn you with about 1,500 miles in hand. 

On average, it takes 1.5 liters per 1000 km. 1 liter of AdBlue costs 1.6 euro.

You won’t be able to just stick a tiny amount back in the tank for it to work, either. A minimum amount will need to be replenished for the car to start again. We’d suggest you top it up as soon as the warning appears – it’ll save you hassle further down the line.


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