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So currently got a rental peugeot 3008 sitting on my driveway. The top up AdBlue light came on whilst I was driving back from Heathrow overnight and I had no idea what it was, having never heard of Adblue. Anyways now it won't allow me to start the vehicle without topping up. I have been out and purchased some adblue but after putting in a small amount (maybe a litre?) it just started to overflow all over the driveway. It won't take any more and it seems to be full up to the cap. I have been on hold to the Avis breakdown line for about half an hour so just wondering if anyone has any advice on how to sort this out whilst I wait in the queue? Could the cap be blocked somehow and is there any way to easily fix this? Might the level settle down after a while and allow me to put more in? I have had a look around and the tank should be around 17 litres or something so it should've all gone in fairly easily but it's not happening. According to the manual you need to top up a minimum 5 litres if it is empty and it definitely hasn't taken as much as that so far.