Most water-cooled PCs don't use automotive antifreeze (ethylene glycol) because both the thermal conductivity and specific heat of antifreeze are not as good as water and the viscosity is much higher, which means more resistance to flow.
Now a lot of people do use 15% to 20% antifreeze in water mix for its anticorrosion properties, particularly in systems with aluminum (or anodized aluminum) parts.
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