What is AdBlue?
AdBlue is a brand name for an additive that is 32.5% urea and many manufacturers are using it in their diesel powertrains to meet Euro 6 emissions regulations (all diesel cars and vans registered after September 1, 2015 have to emit a maximum of 80mg/km of NOx – less than half the previous cap – with many vehicles sold before this date already complying with this rule).
How often do you need to top up?
Some diesel vehicles need a top-up every 3,000-4,000 miles.
That’s effectively every six tanks of fuel (assuming 500 miles per tank).
If the warning light is ignored and the AdBlue runs out, the vehicle stops and will not restart until it is replenished. When this happens will depend on the car and how it has been driven.