I'll probably be banned from this site but

Excellent analysis of pure deionized water. Unfortunately the question regarded a 50-50 solution of DI water and antifreeze. I mixed the same today and the pH was 10.78 which is alkaline compared to the acidic pure DI. In water treatment at my workplace the elevated pH is proportional to the non corrosive water characteristics.

Case in point is a water pump seal failure after 210,000 miles on a vehicle I purchased new.

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1991 350 SDL
114,000 miles