Correct answer
Cylinder-head gasket damage connecting the two passages.
A damaged cylinder-head gasket can lose sealing between coolant and oil passages. This is a possible cause, not a certain diagnosis from finding water or emulsion in oil. Check the source and fault; coolant loss or overheating alone likewise does not prove gasket damage. A broken external hose normally leaks coolant outside and does not itself connect the internal oil passages.
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An external hose that only leaks coolant outside.
Cylinder-head gasket damage connecting the two passages.
An external sump groove that does not connect to the cooling circuit.
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