Instruction book Audi A4 Version Year 2014
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 Audi A4   General maintenance   Checking and topping up fluids  Selective catalytic reduction
On Audi A4s with selective catalytic reduction, a solution of urea (AdBlue) is injected into the exhaust system upstream of an NOx catalytic converter in order to reduce nitrogen oxide emissions.
The AdBlue is held in a separate tank on the Audi A4. AdBlue consumption is approximately 0.5 - 1.2% of diesel fuel consumption.
As soon as a message appears in the instrument cluster display reminding you to refill AdBlue, you must refill the AdBlue tank or have this done by a qualified workshop Link.
Note
  • The display will tell you how far you can drive before the tank runs dry Link. If the AdBlue tank runs dry, the engine cannot be started again after you switch off the ignition.
  • The use of AdBlue for the operation of this Audi A4 is required by law.
Engine Oil 1L Longlife - Audi Fleecejacke - Audi Mug -  Audi Beanie - Audi all-weather floor mats -  Genuine Audi Interior Cargo Organizer

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