I have had two leaks around oil filters - both after the ferd garage changed the oil _waranty work, they do the change. Another check, what color the oil and type. Put a newspaper under the engine after the day is done, and the car just stopped. helps determine loction. Maybe even some paper towels, a few layers thick.
I had a leak in the Ranger, the first couple of leaks were the filter - seems ferd filters had a problem with gaskets. The third leak, which absolutely had me irked beyond nelief, turned out to be a power steering pump. This is how I determined the issue - with paper towels and a location check. paper towels also helped me to isolate the type of oil. Not as easy as it sounds, you have to clean up the engine a bit.
Ferds are also famous for the power steering lines corroding out. My father drove Ferds, I drove a couple before becoming a CHEBY man for a few years (but their small trucks are junk - I know I will catch hell for that), then became a Ranger driver again the last five years - LOVE MY RANGER!!!!!
But I digress....ALL my ferds regardless, lost the lines in the power steering pumps at some time or another, and they started with a piddly little almost a looks like engine oil leak. All my friends who drive FERDS will relate to this, no matter the model, size or type. I think just putting the blue oval on the vehicle (even though it may be a Mazda in disguise) makes this happen.
Just an alternate thought. Ford is not generally known for gasket leaks but for the oil pan issue mentioned.