Oil leaks

[Jeremy01]

I have a 2007 Silverado 5.3 been leaking oil for a while got worse last week oil sensor needed to be replaced I also replaced the valve cover gaskets still leaks I got under it cleaned it all up fired it up it was leaking out of the bellhousing went out and got rear main seal plate had it put in 10-15 minutes running no leak after an hour running time back to leaking again same spot I'm ready to pull the hair out of my head what do I do to fix this

[Doug_Scott]

The rear main seal requires you to remove either the engine or the transmission.  When you had it apart did you happen to look at the back of the engine under the intake or anything above the rear main seal? 

You sure it is engine oil and not transmission oil?