May I suggest before you spend a dime......... Auto parts stores will sell an additive that shows up under black light. Put the additive in, use the black light and find out "EXACTLY" what is leaking. For all you know it could be nothing more than the rear seal on the intake or a back corner of a valve cover. IOf your
oil sending unit is on the back it may even be that.
1. Go to a parts store buy leak detective
2. Go to a 25C carwash and wash the motor with soap and hot water
3. Drive it home let it dry
4.Put the additive in it and let it run
"Find the ACTUAL' leak with the black light, which may not be necessary to use.
Then repair it!
Haven't used Cobra Dans trick for years but am getting ready to on my wifes car as we speak.
DV