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Do all diesel automobiles require AdBlue topping up?

Regarding your comment in the Audi A4 review that "all diesel A4s have a 12-litre AdBlue tank that will require topping up between services; the automobile warns you 1,600km before it runs dry". I presume a similar feature will apply to other marques. How much roughly do you think it will cost to get it topped up, and what would happen if it's not topped up? Will the engine refuse to run or will it damage the engine (as well as the environment)?


Filed under servicing - Asked by Philip Donegan (Ballina) - Mon, 19 Oct 2015 16:00

Neil Briscoe Answered by: - -


Hi Philip,

Not all marques and not all models use AdBlue as yet. AdBlue is a urea solution that can be injected into he exhausts of diesel automobiles to neutralise a significant proportion of their emissions of nitrogen oxides (NOx) - very much in the news at the moment of course. The rule of thumb is generally only that larger, more powerful engines need an AdBlue treatment system as many smaller engines don't need the assistance. Each manufacturer, and indeed each individual engine, will have its recommended AdBlue top-up times, and it will be directly related both to mileage and how much acceleration the automobile has been doing. You can top up the AdBlue tank yourself - a 1.5-litre refill should cost around €11-12.

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