Adblue is simply that (lowers emissions) but no need to worry about the cost as their is no charge. If a Dealerships tries charging tell them it’s included and should be put on thier system as ICME code 2317. Use the search box and you will find a few discussions on Adblue. One of which although 2 years old Motability confirmed it to a previous helpful poster GlosGuy who posted:
Glos Guy
OK. I now have a definitive answer from Motability and they DO pay for all AdBlue top ups throughout the duration of the lease. Quote from the reply to my email;
“I am pleased to advise that the Ad-Blue top ups needed throughout the life of a Motability agreement would be free of charge. You would simply need to take the car into your dealership and they will arrange this for you”.