Why is oil coming out of these?

MRL Performance said
LOL Welcome to MY World! I do believe there is no such thing as "bolt on and go". Procomp to Jesel, its always something.

What did you do on the pro comp manifold to stop the oil leak at these Plugs ? Whatever you did seems to have worked , the pro comps you have used for customers seem to hold oil . Never had a problem with my Air Gap