My 2014 Rubicon does the same thing on cold startups . Been doing it for on to 3 years now. Apparently Jeep feels that the parts are oil coated from the last running to handle things I do know that when I pull out the filter cart. that there is no big mess running down everywhere. I got to thinking about having an oil pressure gauge so I drilled out the top of the filter tap and run a 1/8th inch tap in it a screwed in an electric pressure into it. On a cold start it will go to just under 100 lbs 'til it warms up and runs at about 30 lbs. thereafter. I'm kinda anal about having an oil pressure gauge I can keep an eye on when leaning badly or steep climbs.
