Hello, today I dared to fill up the additive tank. I bought the original set from Ebay for 40 €. Unfortunately nobody could describe it here and so I armed myself with my English HAYNES repair instruction under the car and looked at if this becomes a complicated thing. The Volvo set consists of a small canister with the additive, an empty overflow bottle and two hoses. The big thick hose with shut-off ha hn for the additive canister and the thin hose for the overflow tank. A quick coupling is attached to both hoses at the end. With the overflow hose this quick coupling is angled, the filling hose is straight. By this one also recognizes which connection which hose has to be connected. Thus everything was quite simple. The closing plugs are also designed as quick coupling, so press on it and pull off. (Attention at me came from the filling line a small M Then put the two hoses on the respective connections as described above until they snap in audible. Take the filling hose over the rear right wheel upwards. Open the lid and screw the shut-off valve attached to the hose onto the additive canister. Turn the canister on the head and open the tap. You can then see how the additive (a black-brown slightly ally liquid) runs through the hose into the tank. only when it was almost completely empty, some liquid came out of the overflow hose, so for me it was the indication that the container was full. Quick couplings solved, superfluous additive which was still standing in the hose, ran back into the canister and finished. Caps again plugged up and was good. Now still our good TEXA workshop computer connected, which has sc hon recognized from the control unit that the additive tank is full, but in the submenu then went again on additive tank RESET and finished. All in all, the whole action did not take 30 minutes and I would do it again and again as I now know how to do it. Hope I could give one or the other with this valuable tips. Unfortunately I didn’t have my camera with me, otherwise I would have captured one or the other in the picture. Greetings Rüdi Greeting Rüdi