Re: Rusty Coolant
For 28 years I have used only tap water in my 1929 RPU radiator, without any sign of rust (and no cooling problems either). I know this sounds strange, but it is true. I put this down to either the quality of the water, or the fact that I occasionally tighten up the grease cap on the water pump which pushes a little water-soluble grease into it. Last time I took the radiator hose off and looked inside, there was a slimy, greasy film on it that (I assume) is protecting it from rust.
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