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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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