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Probably, a good idea; to download the service manual, if you don't have one:


The 2.5L is known for oil leaks; in particular, from the vacuum pump and these leaks, tend to seem to seep down the engine, making pinpointing the source of the oil leaks a challenge.

The vacuum pump, can be resealed; using gasket kits from sources like RKXTech.


Good discussion about the leaks and kit install results:


The use of uv dye; might be helpful, in showing where the source of the oil leak is?

UV Oil Dye Leak Detection Kit


UV oil Dye

 

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White Font Line Auto part Drawing


As noted, I would definitely check the valve cover gasket and vacuum pump first, for oil leaks. Aside, from that; looking at the engine block, in the area, in question... the front (#4) crank seal/cover, could also be a possibility?
 

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Maybe, a bit tough to pinpoint; the source of the leak, you have the crank cover, oil pan, possible residual oil that is terribly common coming from the vacuum pump and then, other typical gaskets issues, like the valve cover as well. As noted, in the discussion I linked to above with the vacuum pump leak; he was having a tough time, even after installing the pump gaskets, for the residual oil drips to finally go away, as oil seems to pool up in different areas.

As to UV dye; its cheap and worth a try? It maybe a case, where the dye; can highlight the source of the leak, that maybe not obvious, from what you are seeing now?

Hopefully, you can nail this down soon; as noted, the 2.5L engine oil leaks we have heard about from members, seems to be primarily the notoriously leaky vacuum pump seal failure. Have you resealed or replaced the vacuum pump yet?
 
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