WITH YOUR DEALER:
The easiest way to refill your AdBlue is to talk to your Nissan authorised dealer, either as part of your normal maintenance programme or as a separate visit. If your car shows a warning that it is low on AdBlue you should make an appointment immediately.
BY YOURSELF:
It is also possible to refill AdBlue yourself. It is available widely at filling stations and automotive stores in packages of 1.5, 5 and 10 litres.