The rate at which you use AdBlue depends on your engine and how economically you drive.

Typical consumption is around a litre of adblue def every 600 miles.

But it could be as high as a litre every 350 miles.

Tank size varies too, so you could need to refill somewhere between 3,000 and 12,000 miles depending on the car and your driving style.

This means that most drivers will have to top-up their AdBlue reservoir at least once between normal service visits to the dealer.

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.

The car will give you plenty of warning that the AdBlue tank’s running low. You'll usually see a text warning on the dashboard at around 1500 miles to go by an amber warning light.