You cannot repair the leak until you determine where it is leaking. More than likely it is leaking from the oil filter, oil pressure sending unit, or valve cover gasket. Check around the oil filter for a leaks and if you see oil on the filter then replace it. Check the oil pressure sending unit and if it is leaking replace it. Wipe all the oil off the bottom of the engine and any other place you see oil. Now place newspapers on the floor under the car and then start the engine and let it run for about 10 minutes and then shut down. Wait overnight and you can see where the leak is coming from.
Try putting a dry piece of cardboard down and then park over top of it. That will allow you to find where it's dripping from at least. Then you will just have to get under and follow the drip to see exactly where it's coming from. If your oil filter isn't on tight enough or is old it will drip from there. Could be the oil pan too if the gasket is bad. But first you will just have to follow the oil drips to see if it's leaking on a hose, or something up top, then running down and dripping or if it's coming directly from filter or pan. When you find out the source that should lead you to what the cause is.
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