I think you are better off to use auto antifreeze mixed 50/50...then you won't have to worry about exhaust or engine....it will be fine. Those of us that do that don't end up with frost related repairs.
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Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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