My theory on the "oil" found floating on top is that as the head gasket detereorates around the water ports between the cylinders,it dissolves and mixes with the coolant. It does appear to be oil, but if you skim some off and let it dry in the sun, it turns to a gritty substance as the coolant evaporates from it. What leads me to this conclusion is that I've never noticed it on one that had the all metal head gasket,only with the fiber type. Other than a black film in the radiator,it has never caused me a problem,but is a sign that you may be needing a head gasket sometime in the future. No matter how black your oil is, if it has much water in it, it will at least turn gray. In any case it would be much easier to get water in the oil with the assistance of compression/combustion/bad head gasket than the other way around.
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