Reply To: Corrosion in cooling system

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I use plain tap water in my Series 33 to which is added Pencool 3000 as specified on the container. This will stop the interaction between the different metals. You’ll find this product at truck parts houses. There are other products of the type on the market, however, at least some of them cause foaming. Pencool does not. Pencool can also be used with anti-freeze, however, plain water cools better than anti-freze.