valve cover leak

Hi All, This post is more to see what others have encountered and dealt with for a leaking valve cover gasket followed by issues with O2 sensor throwing check engine light with code P0137. I am also posting to see if @JeepCares will step in and assist with anything on this matter. What has...

I noticed an oil leak around my ignition coils that I presume started since my last oil change (no surface oil upon visual inspection). What can cause this to happen? I'm curious in case it's an operator error and I need to change how I drive after it's fixed. I don't drive like a banshee...