Longston
I checked the bottles of the coolant again, and it says Mercedes Benz Antifreeze/Anti-corrosion agent, conforming to sheet no: 325.0 It also states that it is for the cooling system etc. Like it or not, the color is blue. It also stated Nitrite-free in the front label. Maybe that is the specs for Europe.
I am located in the tropical zone, and I have put in 2 bottles of 1.5 liter each into my 260E, mainly for anti-corrosion and coolant. Temp in my country never goes below 20C.