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I was really hoping this would be the cause. It has idled the same amount of time several times since then and it hasn't done it at all in the colder winter months. So maybe if environmental conditions are right for it to happen, it makes the condensation worse. I'm in Mississippi and it can be hellishly humid mid-spring through early fall.

I guess I feel a little better now. Not so paranoid. But I will keep checking oil levels to see if it's losing any and check the piping this weekend when I have a few spare hours.