If you want to save time, uneeded repairs and pulling your hair out on oil leaks put some dye in the engine. Most of your dealerships and a few parts stores sell tracer dye. It's about $4.00 a bottle. Matco, Cornwell & Snap-On -Tools sell a pocket Black light that looks like a ink pen for $25.00. Pour the dye in your oil and run it awhile. Park in your garage or in the shade and take the light and look for the yellow streaks. Follow the streak back to the source. You may have to pull a dust pan or move a few things but you will get to the problem and not be wasting time or money. The other posts were correct you need a mirror and it probably is a rear main leaking. The Black light is a good investment for your tool box.