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A neat trick I learned from my radiator shop guy, is to put a small piece of magnesium in the cooling system. It somehow counteracts the electrolysis damage that occurs in cooling systems/engines with a lot of aluminum. Also, not to add to the coolant debate (I have not read the old threads on the subject and want to learn), but if not green, what coolant came in the 1980's Diesel MB's? I can see that the newer aluminum head engines probably need different coolant, but the older iron head engines probably came with green coolant from the factory (only coolant available at the time?)....Rich
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