The reason to use distilled water is that it does not have any calcium or iron in it. If you use tap water and you have high calcium content then you can plug the radiator/heater core faster.
I have been using the premixed Cool guard from John Deere the last few years in all of my diesels. (there are others brands out there but I get a better discount on the Deere stuff) It is not that high and the blocks do seem to stay cleaner. I had to tear into an engine I had rebuilt a few years ago. It did not seem to have as much rust and stuff in the water jacket.
If you don't think it is worth the extra cost then do use distilled water. Rain water will work too.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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