ok.. way to narrow it down. Common area of oil leaks are valve cover(back side), make sure your oil drain bolt is in good shape and the seal on the bolt is not dry or broken.you will see some oil on the pan. Also oil filter housing tends to leak as well... Good way to tell is look at your starter if its covered in crap and the cables as well. That would be a good place to start.

forgot one, rear main seal. Pull the inspection plate from the bellhousing of transmission and see if there is alot of oil inside.