I had the same failure, went to Wal Mart, spent under $5 and bought some radiator stop leak. It held for many months prior to VW buying the thing back.
If you go this route, make sure you get the correct type, as there are several for different Anti Freeze types.
I have the booklet, and have still had a dealership deny free adblue. Thats why I was looking for source on this much more direct statement.
"AdBlue® re-fillings will also be offered free of charge between service intervals for:
- 10 years or 120,000 miles, whichever occurs first from the...
cour·te·sy | \ ˈkər-tə-sē , British also ˈkȯ-\
Definition of courtesy (Entry 1 of 2)
1a: behavior marked by polished manners or respect for others : courteous behavior
b: a courteous and respectful act or expression
2a: general allowance despite...
That's the document, but I'm looking at page 5:
AdBlue® (diesel exhaust fluid) usage may increase, and, as a result,
require more frequent refilling of your AdBlue® tank. As a courtesy to
you, your vehicle will be returned to you with a full tank of AdBlue® and
fuel during the Approved Emission...