Join Date: May 2006
Location: Left Coast USA
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Their source implies oxidation layer (which is passivation) after several weeks in fresh water. Maybe, but we are talking about a closed system here. I would be more concerned about rust than electrolysis myself. And I am not so sure that flowing hot salt water would not overcome any passivation pretty quickly.
You can also run white vinegar through your engine to remove any built up salt deposits. But fresh water fill will do that over time too.
Whatever you do I don't think there is not a lot to worry about one way or the other. Me, I would flush with fresh water.
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Currently in Long Beach, CA