Volkswagen AdBlue
Volkswagen AdBlue
Volkswagen AdBlue

AdBlue® Technology

Enhanced emissions control for diesel engines

Enhanced emissions control for diesel engines

What is AdBlue®?

To help protect our environment, some Volkswagen TDI models are now fitted with AdBlue® emissions control equipment which cleans exhaust gases helping cars to comply with the new EU6 exhaust emissions regulations.

AdBlue® is a non-toxic, non-flammable; biodegradable urea and water-based liquid additive that processes the gases in a car exhaust system to remove harmful nitrogen oxide (NOx) emissions. The AdBlue® solution is stored in a tank positioned near the car’s conventional fuel tank, accessed through a cap usually found at the rear of the car; its location will depend on the model.

The System works by injecting minute amounts of the solution into the exhaust system when the engine is running. The chemicals in AdBlue® break down the polluting NOx emissions into harmless water vapour and nitrogen gas.

The size of the AdBlue® tank fitted to your car will vary depending on which Volkswagen model you have, therefore the interval between top ups will vary. In addition many factors such as mileage covered, journey types, driving styles and environmental conditions can influence how much AdBlue is consumed. A passenger car will consume approximately 1.5 litres of AdBlue® approximately every 1000km.

AdBlue® belongs to the lowest water pollution hazard category but is a skin irritant and a corrosive liquid that can cause injury if it touches the skin, eyes or respiratory organs.

How do I know if my Volkswagen uses AdBlue®?

A simple visual check will reveal if your car uses AdBlue®.

The AdBlue® filler nozzle is located either next to the main diesel fuel cap (Passat, Tiguan and Amarok V6) under your car’s filler flap and looks like a smaller filler nozzle. Simply opening the filler flap will reveal the AdBlue® nozzle (if fitted).

The AdBlue® cap is unscrewed either using the screw cap or using the car’s wheelbrace, which is found in the toolkit.

Please refer to your car’s handbook for further information.

Does my Volkswagen use AdBlue?
How does AdBlue cut emissions
How AdBlue® helps cut emissions

Reduced raw exhaust emissions are achieved in TDI engines equipped with AdBlue® through a modified fuel injection system, exhaust gas recirculation and optimised turbocharging.

The Volkswagen low emission system uses a DeNOx catalyst, diesel particulate filter and injection of AdBlue®. The AdBlue® solution is stored separately from the fuel tank and is pumped in small quantities into the exhaust pipe ahead of the DeNOx catalyst when the engine is running.

The quantity of AdBlue® injected depends on your driving style, engine loading and atmospheric conditions.

How to replenish your AdBlue® tank

How to refill your AdBlue

A dash message will inform you if the AdBlue® reservoir is running low (see above). It is important to note that the engine will not run if the AdBlue® supply is exhausted.