Oil leak around exhaust manifolds

[Moose88]

For a while now I have had oil leaking onto my exhaust manifolds and I cannot figure out why. I had a mechanic "fix" it twice and it still leaks. After the first time he recommended that I replace the VCs because the old ones might be bent so I got new ones. He also replaced the PCV valve. But it still leaked. I then discovered that the VC bolts were hand loose and I decided to replace the gaskets that were glued on and the bolts. But it still leaks. On the driver side it looks as if the oil is "bubbling" up from the exhaust manifold connection to the block but i cannot tell if the oil is just running into the joint or originating from there. I cannot see where it is coming from on the passenger side.

Does anybody have any suggestions that I could try before I haul it in to a different mechanic? Thanks for your help!