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start simple:

This is the point. If you aren't loosing coolant - you don't have a leak. Also if there was a leak the oil level would increase and coolant would turn the oil milky right away. Condensation will also turn the oil milky after a period of time but not near as quick. Remember to that ice cold the coolant level will look to be somewhat low in the radiator, after it is warm it will expand somewhat.