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Has the coolant tank been "sniffed" with a hydrocarbon sensor?
I would order an oil analysis kit, drain the oil (capture sample), refill oil, new filter and do some highway driving.
It does take some time at temperature to get the water condensation out of the crankcase. How long is the water temp gauge at hot? It takes much longer for the oil to get hot.
If there is coolant in the oil - it WILL show up in the oil analysis - if it's just water it will show up as well. One comment on the fixed leak, this does not mean you couldn't have had a leak elsewhere or another started under pressure. Not trying to scare you - my money is on just condensation. Science will tell, not BB speculation.
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http://www.fidalgo.net/~brook4/oilslubesfilters.html
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