For anyone else wondering, "ad-blue" is another term for DEF (diesel exhaust fluid), which is a chemical used to decrease emissions from diesel engines. https:

For anyone else wondering, "ad-blue" is another term for DEF (diesel exhaust fluid), which is a chemical used to decrease emissions from diesel engines. https://en.wikipedia.org/wiki/Diesel_exhaust_fluid https://en.wikipedia.org/wiki/Diesel_exhaust_fluid