Blown Head Gasket - DIY? what else to inspect/replace?

[JCochrane]

I believe once the oil and coolant are mixed and become milky, they will not again separate. Oil with coolant in it and then running the engine is like putting them in the blender. Don't run the engine again once you see the oil is milky. The oil will have lost its lubricating property, you're done with it. You'll only see oil and coolant separately if you have not yet run the engine with coolant already in the oil (and of course, you then drain the oil into a pan so you can see it).

You'll be able to tell if the oil is milky by a quick look at what comes out on the dipstick.

...

I would expect oil and water to separate out over time, but perhaps not. The dipstick, last I checked, actually looked ok... clean, brown oil...