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Extra emission controls, but with a difference.

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What is diesel exhaust fluid (AdBlue), and how does it work? - Drive

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What's the deal with Diesel Exhaust Fluid (DEF)?

Adblue, VW Parts

PENBLUE (ADBLUE) DEF - Diesel Exhaust Fluid

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What is diesel exhaust fluid (AdBlue), and how does it work? - Drive