when was the last time you changed your pcv valve?
most likely its just moisture.
its going to happen when it gets cold like it has been. especially if you do a lot of short trip driving(by short trip i mean under 10 miles)
your car doesn't fully warm up, and you ahve incomplete combustion, there are more vapors that collect in yoru crankcase, if these vapors aren't expelled they condense.
i woudn't worry about it unless it was mixed in with the oil on your dipstick.
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