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I was told to use catapiler antifreeze since it has something in it just for that. That lots of machines and trucks have that problem so thats what I used.I went ahead and got the premixed one it is red in color.



I'm certainly no expert, but hot water heaters have a "sacrificial anode" for this purpose, and trucks have chemically treated water filters and other chem additives for the cooling systems. I don't pay attention to trucks anymore, so I don't know if many use aluminum radiators or not