Head gasket, if you have a V6 or a V8, can't tell which one is at fault, so both will might as well be changed.
If the leak near the maifold is oil, the valve cover gaskets are leaking.
When head gaskets are changed, all the necessary gaskets come in the gasket kit.
There has been a breach between the cooling and lubrication systems in your engine. most likely a gasket. this is not a good thing. look inside your oil fill cap and see if there is frothy antifreeze there, another bad sign. you need to get a repair ASAP.
SOUNDS LIKE THE INTAKE MANIFOLD GASKET IS LEAKING OIL INTO THE COOLANT, SEAL THE MANIFOLD 1ST THEN SEE IF THIS PROBLEM STOPS.
Had this very same thing happen, it was the water cooled oil cooler that was leaking. It was very expensive to repair properly. They will most likely have to replace all the water hoses as well as the radiator and heater core, pretty much any thing that has oil contamination. I think they had to pull the motor to change the oil cooler since its on the back of the motor just above the trans bell housing. Anyway the dealer was the only shop I could find to do the repair and it cost me about $2300
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