John:
There's a well-known MB salvage facility somewhere in Georgia - I think Atlanta. The fellow who runs it has torn apart a kazillion MB engines. In addition he holds a degree in chemistry. I cannot remember the name of this place, but have seen a discussion on the WEB back when that he participated in regarding the green vs. MB stuff.
His belief mirrors yours and mine. Pure bunk. The neck is made of plastic. Extremely corrosive chemicals, far more corrosive than any coolant are shipped in plastic containers far less durable than the plastic in an MB neck. He too said that it was overtightening that killed the necks.
I use MB coolant, more for overall internal protection; not because I fear the green stuff will break the upper radiator neck.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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