Hello dear FoRumsfRounde, after extensive research here a excursion on the topic of coolant: If you roll the operating material regulations of Mercedes, you come to the conclusion that our cars demand a cooler supplement/refrigerant according to sheet 325.0 (concentrate), or also 326.0, that is then already in the ratio 50/50 with water premixed. If you go with this desire to the friendly one, he will usually offer a blue coolant and also the search on the accessories market ze In Germany, however, almost all coolants in the above list are blue, reference here is the Glysantin G48. Now my R-Class from factory Tuscaloosa is filled with yellow coolant and I would like to give if half a litre is missing no blue one. In my search in the list I found two yellow ones according to sheet 325.0: the Zerex G 05 from Valvoline, which is only sold in the USA, and the Glysantin G05. The latter is only available in the 20 litre canister in Germany. This is enough for the next 30 years… This is where the resourceful internet trade comes into play, which the G05 also offers in 1 l or 2 l containers.