oil cooler lines

have 2000 bravada and put new cooler lines in. the one going along the motor screws into a round thing and this seems to be leaking now. i have no idea what it is called or does. and is it servicable? need to know what it is?

and also, how do you delete old threads that have been answered and taken care of?

thank you

Your Oil Adapter has either an o-ring or gasket that can be replaced after removing the bolt and letting it down.
There's a front differential snubber that kinda blocks access to the adapter on my '92 but I don't know if that was straightened out on the 2000's.