Hi A few questions re: AdBlue for those of you with the latest A6 Avant 40 TDI or 40 TDI Quattro: 1) Is the AdBlue filler cap located next to the regular fuel cap? 2) Can the AdBlue cap be opened by hand or does it need a special tool? 3) Whats the capacity of the standard AdBlue tank? 4) What sort of mileage do you get before the AdBlue warning light comes on? I believe it comes on when you have 1500 miles left. 5) Finally, i believe the dealers charge a small fortune if you ask them to do an AdBlue fill up, supposed to be far cheaper buying the AdBlue yourself & topping up as & when required. Would something like this do the job? amazon.co.uk/CleanAirBlue-Adblue-Cans-Spout-total/dp/B01KOEMJIW Alternatively, can you fill up from the AdBlue dispensing pumps at Shell/BP/other fuel stations or perhaps the nozzles don't fit? Many thanks!