You are kidding, right? The standard green coolant - or any coolant not approved for use in an mbz engine for that matter - does not adequately protect the aluminum parts from corrosion. Do a search - there are accounts out there of pieces such as cylinder heads and blocks which were removed and then examined. Sharp edges adn mating surfaces were rounded, and other evidence of corrosion throughout the cooling system. I know on my 300E the PO used green coolant and the pump fins were all rounded and corroded when I removed it. I promptly switched to Zerex G-05 and hoped for the best. Fortunately the head gasket never gave way.

Bottom line is: green coolant in Mercedes = BAD

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280