Going back to my days at the dealer now. We did MANY head gaskets on 12V v6 engines, was always oil leakage. Usually they leaked when piping hot at RPM. The place to look is in the valley between cylinders 4 and 5 (front two of your passenger side). Get it good and hot, clean aggressively and hold engine at 3K revs. Watch for oil forming at head to gasket joint.
The other common failure is the oil cooler, check the overflow bottle for oil residue. Due to differential pressures the two fluids go either way (kinky, no?). When the engine is running the oil pressure is higher so oil migrates to the coolant. After shutdown the cooling system pressure is higher so coolant migrates into the oil.
Hope this helps, Cheers.
Dan
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