Why are you having trouble pinpointing the leak? You can usually find the source of an oil or most other fluid leaks by using a flashlight, and shining it around the suspected leak locations, either at night or in a dark garage. If the engine is too dirty and oily to pinpoint a leak, you should use some engine cleaner, spraying and rinsing, maybe even using a toothbrush to get any thick gunk, until it's down to clean metal or the paint, then let it dry, and after a few drives, when the leak shows up again, if you still can't tell just by looking, the flashlight in the dark method should show the path all the way to the source.
Oil leaks are most common from the valve cover gaskets, the head gaskets, and even the rear main seal and sometimes the oil pan gasket. All but the rear main seal are pretty obvious from the height of the oil path. You won't be able to pinpoint a rear main seal leak, there will just be oil leaking between the transmission and oil pan, and might show up on the bottom of the pan, transmission, or even the part of the exhaust Y-pipe and starter power cable under the transmission.
Oil doesn't really take a particular path through an engine, it just gets sucked up by the oil pump, goes throughout the block and heads, then drains back down into the pan in a continual cycle.
she's leaking oil, but i can't tell from where. could someone educate me a bit on the pathway oil takes in a 1994 explorer from start to finish? it'd help me out a ton and i'd be really grateful! 
