I am also seeing that cars that have always had Mercedes coolant (best) or an acceptable alternative, have longer water pump and radiator lives. I am not sure yet on Tstats.

I was buying oil the other day a a local parts store. I was surprised to hear the employee tell a customer:
"If you want the best coolant, use the Mercedes stuff. Expensive, but there is just something about it."

Of the three 'Benz that I have now, one had MBZ coolant for all of its life and it is the one that hasn't had any coolant issues.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)