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Only way to get coolant mix in engine oil is internal engine failure or oil cooler in radiator failure, when oil cooler goes usually mixes other way oil in radiator, probably has intake manifold gasket leaking internally...rick
My question "What to do" has not been answered. Sorry this does'nt help.
have talked to a coupe other techs about your problem, seems most common problem is oil cooler under intake manifold leaks coolant into engine oil, but normally always mixes oil into coolant because oil pressure when running higher pressure than cooling system, if no oil is found in cooling system then is either bad head gasket, or internal crack in engine block where no oil pressure exists, like cylinder wall area, in all cases must disassemble engine to locate source of leak, can start by draining oil leaving drain plug oil , pressure test cooling system and see if coolant comes out of drain plug when still out, time to pull engine apart,,rick