Hello, we have the purchase of a new tractor with 370hp (Massey Ferguson 8690), which has a 50 litre “ad-blue” tank which has to be refueled with every 2nd tank. Now I’m stupid but I don’t find a price for a litre of ad-blue (urea) or a supplier of this stuff…. Where do truck drivers actually get this urea? What happens if the tank is empty? Does it still run or does it just stop? I have only found out up to now that Ad-Blue costs 6% of the diesel costs of the respective vehicle … mfG into the truck round, Tom