Hello Flipper Dog,
I have a Sharan 7N (2.0 Diesel 130kW) and it needs AdBlue too.
At first the "AdBlue" from your dealer is the same "AdBlue" like this from the truck service station.
The VW dealers in Germany takes round about (EUR 7,-) $11,- per Liter. At the service station I only pay (EUR 0,54) $0,85 per Liter.
I bought the AdBlue adapter from VW Crafter and it works perfectly.
You must push very slowly and carefully otherwise it slops over.
And automatic stop in the pistol works like the fuel pistol too.
I hope I could help you a little.
I can try to post a picture of the adapter if you want.
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