How to Check Your Ad Blue Fluid on a VW Passat TDI

AdBLue dashboard light 1 photo
Photo: screenshot from Youtube
You've probably already of brake fluid, engine oil or windshield washer fluid, but you've probably never heard of refilling or checking AdBlue or clean diesel fluid right? That is, of course, unless you're a Volkswagen owner.
Some Volkswagen models (the more premium ones, of course) are fitted with a reservoir of fluid called Ad Blue. This is sprayed into exhaust fumes and significantly reduces harmful elements.

The Ad Blue, or diesel exhaust fluid as most people know it, is part of your initial scheduled maintenance and should last as much as the engine oil. However, consumption of the fluid can vary due to climate conditions and your driving style.

If you're low, a special light will flash on your dashboard. Be warned that if you do run out of the stuff, the all-mighty Passat will probably not start. The tank is sutured on the right side of your tank, so you can buy a bottle of Ad Blue from your dealer and fill it up yourself if needed. The bottle has screws into place and you have to press it down to fill the tank.

Ad Blue releases ammonium into your catalyst, reducing NOx emissions into oxygen and water.

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About the author: Mihnea Radu
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Mihnea's favorite cars have already been built, the so-called modern classics from the '80s and '90s. He also loves local car culture from all over the world, so don't be surprised to see him getting excited about weird Japanese imports, low-rider VWs out of Germany, replicas from Russia or LS swaps down in Florida.
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