I'm guessing it could be one of two things. 1: one of the head gaskets is starting to fail and has a small leak. These are the hardest to detect and usually it's hard to diagnose them before they totally fail. A leakdown could give you an indication, but if it's as small as you say it is, you may not see anything.
2: a plugged PCV system will cause condensation to build up in the engine because the vapors have no place to go and it liquifies and looks like there's water/coolant in the oil.
good luck, keep us posted on what you find!
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