Well, I will just tell it like it is... seeing this type of thing before on these vehicles:
DO NOT DRIVE IT.
If its already hit the point of contaminating the oil (milky color), its begun doing slight damage to the bearings, the more you drive it, the worse damage it will do.
Unlike the older engines, which loose the lower end first, these will sieze a camshaft or gauld the camshaft seats in the head. There are no bearings, only the aluminum itself. So if any damage is done to the surfaces in the head, you'll be find another head
I'm not saying all this to scare you, its just a fact with these engines.
Keep in mind, sometimes your driving habits (short trips) can cause condensation in the oil filler cap. See if you can reach under the cap area in the valve cover to see if more of the "Goo" is in there. But if your having to add fluid also, chances are good you have a headgasket problem.
Good luck with it, let me know if I can help ya. If you decide to tear into it, pm me and I'll give you my phone #. If you get into trouble you can call.