Coolant leaking into the engine oil is one of the less common ways a head gasket will leak. If the cooling system is not full it isn't going to build any pressure and no coolant will get forced into the oil return passages. If the leak is between an oil pressure passage that will force oil into the cooling system, not the other way.
It is good to change the oil when coolant is in it because antifreeze will melt the first layer of the soft engine bearings.
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Thursday, March 28th, 2013 AT 4:59 AM