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C 123 power unit engine, antifreeze in oil!

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This  1960 engine has about 1500 hours and never taken apart.  It starts and runs perfect. I've had engine 25 years and always check/test fluids every fall.

Now i'm slowly getting trickle of antifreeze in the oil that builds up enough to notice a substantial over fill on the dip stick after sitting a month at a time.

Any ideas/help.


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This motor has wet sleeves sealed on the lower end by a single o ring. Drop the oil pan and check for leaks around the sleeves. 

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