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I have heard of (in rare cases), where the material (in this case aluminum) is actually is porous to a small degree due to a flaw in the casting process, allowing liquid to seep thru the material itself.
I believe in one case it was an engine block. They couldn't find where it was leaking until they did a dye test, which showed it was leaking directly through the wall of the engine block. Weird huh??
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