First AdBlue. Top-up or throw away?

[acer]

My vehicle was saying something like, add 12.5l min 20l max adblue within 1200 miles. I'd read that the sensor tends to not be too sensitive and that I should be careful to not overfill the tank, so I've put in about 18l. The system now says that the range is 16500 miles. All good. Except, now I don't know what to do with the remaining 2 litres. Shall I wait a couple of months and top-up? Or, because I've read that you shouldn't hang-on to it, should I take it to the local dump? Alternatively, does anyone suggest just to add the remaining adblue to the tank now?

 

[RedWhiteMonkey]

I personally wouldn't add any more now, I think adding a small amount will confuse the vehicle.

In future, it is much easier to find a filling station that also dispenses AdBlue. You can put in exactly the amount you want and there is no waste. I put 17 litres at my local filling station two days ago.