Stu Ritter, the technical editor of the Mercedes Benz Star Magazine, has written extensively on Mercedes Benz coolant and why it should be used. There are many reasons, but one imortant one is that MB coolant has a neutral PH. Other coolants do not. Other coolants will cause MB rubber and gaskets to degenerate.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".