Ddaddy said

Hoat is that different, and you can't replace it with something else once it's all out. The system is designed for it right down to the seals and the water pump. Try something else and you risk destroying the entire system. A lot of guys tried it in the early days and wrecked their cooling systems. I've only seen one or two replacements that worked and those coolants are way more expensive than the HOAT.

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