There have been several threads on 4.108 oil leaks
of late, you may want to do a search to look at some of the other discussions. I'm chasing a leak(s) on mine now. It's like roof leaks in your house - where you see it isn't necessarily where it's coming from. My first step was to go around the engine looking for signs of leaks, I found one on the breather tube that comes out of the rocker cover and goes to the air cleaner - oil dripping down from a loose hose connection, traveling along the edge of the rocker back to the back where it's been pooling at the back of the rocker cover, and then slowly dripping down the rear of the engine. I also found quite a bit of oil at the low point of a hose that passes across the lower front of the engine, not sure yet where it's coming from but it's in the same area you describe. I've found several loose fittings around the engine that have worked loose due to low RPM
vibration and tightened things up. Today I'm degreasing/cleaning so I can run the engine and look for new signs of leaks. I'll be watching this thread to see how it may relate to what I'm seeing on my engine.