This is what my LIM leak looked like after one day when it had gotten really bad and I had to pull over, which seems to have a similar color as your posted pics. It does have kind of an oily feel to it as well.


I was unable to identify the leak when looking from the top of the engine. After I knew for certain what the problem was, I did notice some fluid around one of the spark plugs on the driver's side. Notice where my front fan is located. It seems to be the same area of the engine where your leak is coming from, just on the opposite side.

 

 

I have a similar discussion thread I started when I 1st noticed my LIM leak that you may find useful. I found that one of my LIM bolts was broken. I hope you don't have that problem, since that definitely caused me a lot of additional grief. Consider yourself fortunate, if it is just the water pump. That's a much simpler replacement.
https://www.jk-forum.com/forums/stoc...e-area-343770/

I also included a step-by-step guide at the end, of the work which needs to be done to replace the gasket. It's not a fun job but doable for a DIY home mechanic.

Here is a pic I took once I had the upper and lower intake manifolds off which shows the LIM gasket. So if you're noticing a leak near the belt tensioner, that gasket is definitely in that area.

Here's after removing the gasket. Oil and coolant run through those port passages where a leak in the gasket could cause both an oil leak and a coolant leak, and therefore them mixing together to again provide more of an oily feel to the leaking fluid.

 

Add me to that list of intake manifold. Gaskets on the 3.8 have been know to fail. Mine did at, oh, a couple hundred thousand miles.

 

Now that I got a closer look at the fluid color I vote for a coolant leak.