I have a 2013 JK with about 63K miles. I pulled the upper and lower intake manifolds today to hunt down a coolant leak. Noticed that I had some accumulated oil on the lower intake manifold where it meets the head. There is oil residue on the inside plastic of the lower intake. The upper plastic intake housing has a very light film inside if run finger. Here are some pics. Is this normal, expected, or do I have another issue? If it's another issue, would like to try to address it when I'm putting it back together.

 

That's on par with what I've found in mine. I picked up an oil catch can kit but have yet to install it.

 

That oil looks like it came from the PCV system or the crankcase vent that goes to the intake. Icrashbikes is right - get a catch can and remove the vent system. Have you noticed any excess consumption? Gaskets look like they need replacing and should be done every time one lifts the manifold.