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Hi Sea,
For quite a few years Prestone Antifreeze Concentrate has advertised recommending changing their Prestone antifreeze every 5 years ...... or every 150,000 miles ...... nothing like a win-win protection.
For years, distilled or rain water was recommended for all vintage radiators because neither will leave harmful mineral deposits therin.
Also, often heard people who only drink pure rain water have far less possibilities of developing kidney stones ..... but, most people never listen ..... they pour well water in their Model A radiators and wonder why their Model A cooling systems develop mineral type kidney stones. LOL