Hello all, I have a 2000 TL. It burns quit a bit of oil, maybe a quart a week or so. When I remove the plenum cover it's always filled with oil. Replaced the PCV valve and upper intake plenum gasket. Any thoughts on what could be causing this? Photo attached. Thanks in advance

 

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It's normal, both my 23 y/o CL-S six speed and my (now sold) CL-S automatic did the same thing over a period of time.
If it is a concern, just use a paper towel to absorb and clean up as best as possible.
In addition, if you ever remove the metal upper inlet manifold gasket, make sure to replace it, as shown, with the 'tab' towards the firewall (red arrow).