89cat

Have a slow developing oil leak in "01 Navigator w/ 100K+ miles. Thought at first it was post oil change drip because only occational then more frequent. Changed oil with new filter still leaks. Seems to be coming from the area of filter or above but even with filter off it is difficult to see up there. IS there something typical with this model? Sendiing unit, oil cooler pump, fitting hose etc. Looking for direction before I start tearing into it. Thanks Ahead 89cat