Anyone can do it. The adblue tank uses a special connector. Apparently the easiest way to fill it is to purchase a single overpriced 1 liter bottle from your MB dealer. Add it to the tank, then cut the bottom off the bottle so that it can be used as a funnel. Then go to your local auto parts store, truck stop, or wherever and purchase a 2 gallon container of Diesel Exhaust Fluid (DEF) for about 10 bucks. Use your new funnel to fill the adblue tank with the DEF.