So you don't think coolant in the oil is a problem...... You need to start studying a lot and find another mechanic if he agrees with this. This is ridiculous. Of course the coolant leaks first with a leak between the oil and coolant jackets, it's thinner than the oil. It takes a big hole for the oil to enter the coolant system but by then your bottom end may be trashed.
So, to recap, if there is actually coolant entering the oil circuit you have a problem... PERIOD... no ifs or maybes about it.
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