[fredmeister]

Well I will tell you that I replaced both the lines early last year in my 911SC and at Mid Ohio 2 weeks ago the same line you are referring to separated at the fitting where the rubber section connects to the hard line going to the T-stat. Needless to say that at 90 mph I dumped 12 quarts in about 3 seconds all over my right rear tire and the track and half the cars behind me. I was lucky I didn't spin and wreck the car or blow the engine. Still didn't like the fact that I ran for about 2 seconds with the oil light on before managing to shut her down.
I called Pelican to ask for a refund and am in the process of sending in the line to let them examine the manufacturing defect that caused this. I hope it is not a symptom that turns out to happen more than once as I assume that it was the one in a couple thousand pieces that slipped by quality control from the company producing the lines for Pelican.
Moral of the story is replace them and make sure to inspect the new lines at this critical connection point before installing them. You will need to remove the line that runs from the T-stat back to the sump tank before being able to remove the upper line that you mention is leaking (from the engine to the T-stat). The nuts require a large crescent wrench that will fit a 30mm nut.