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I use 1 1/2 gallons of pure antifreeze and 1 gallon of water, then run it until it's thoroughly mixed, at least 30 minutes. Then I have no worries about rust or freezing.
Running an engine for 10 minutes is doing the engine harm. You're filling the engine and exhaust with condensation. That's exactly how I locked up two engines back in the 70's. That was a costly lesson.