I just found a leak on my 2015 Ford F-150. Took it to ford and they agree it's a leak. Don't know what or where but they want me to bring it back on Monday as they were busy. I thought it was oil but it's not leaving a stain. Whatever it is is evaporating after some time. I'm going to try to attach a pic. I hope it works. It's the cylinder next to starter. Pic is looking from rear to the front. It's located on passenger side. I was told it's the turbo. It's the cylinder on left of the yellow cap has a rectangular black strip on it.

 

I believe there is a TSB for the oil sending unit leaking on these engines, I should be right above the area you see in the pic.
Mine was done several months back along with a slight leak at the oil pan gasket

 

Took it to ford. It's the oil pressure sensor that is leaking. Thank god it's still under warrenty.