Do some research on cellulous media and moisture, and what it can cause. Apparently you ignored the info I linked. I guess you've never seen any milky build up under an oil fill cap? I have many times, mostly in cold weather, and if the vehicle is short tripped and the oil temp stays relatively low. There can be more blow-by condensation in the oil than you think. It happens every time a cold engine is fired up. It doesn't have to make the oil look like a milkshake.So in that case, your moisture expansion theory doesn't hold water (pun intended) because even a small amount of water in engine oil turns the whole thing into a chocolate milk frothy mess, and none of these wavy pleats are covered with frothy chocolate milk, there covered in properly colored engine oil. So where is all this "moisture" - enough to significantly expand these pleats, coming from? It doesn't take much water or coolant at all to change the color of the oil.
Also, if an engine's PVC system is defective or doesn't work very well, then blow-by condensation moisture will remain longer in the guts of the engine and oil. Ever see how much water a PVC catch-can traps from the guts of an engine, especially in humid or cold weather?
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