A warning about Evans Waterless Coolants

1967 'cuda said

Phreakish, I've rebuilt a few motors that had had their antifreeze changed regularly and there was quite a bit of crud in the water passages. - Enough to have probably been a concern. I doubt that distilled water was mixed with the coolant though. Are you saying that the buildup was due to tap water? - Or was it due to the antifreeze breaking down? And on the subject of antifreeze, are some brands more likely to cause problems than others?

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FWIW, with the old brass radiators, the cast iron in the block and head become the sacrificial metal in the electrolysis process. So any electrolysis from whatever the cause ends up in the block and head.

With AL radiators and heads, the sacrificial element is the AL. So the iron block water passages will always look good.

As for A/F, I have been switching to the HOAT types like Zerex G05 for the longevity of the fluid and additives. (Plus you can add in a green A/F in an emergency, unlike Dexcool.)

Cooling System Antifreeze Requirements