The MB and Green coolant will do the same job. However, MB coolant is-phosphate free-which is what corrodes aluminum found in your radiator, heater core, ..etc. Drain that junk green stuff, flush good, and add MB coolant (50/50). You could also use BMW antifreeze which is also phosphate free (blue in color).
1993 190E 2.6
Advanced Diesel Systems Test and Research Engineer