Developed an oil leak out of this thing that sits right above the oil filter. Can't find any info about it in a Chilton's manual or on Mitchell on Demand's site either...probably because I don't know WTF it is called...lol.

I attached a pic and circled the item in question using my awesome MSPaint skills...

What is this thing called (what does it do), and is there a gasket or something between it and the engine?

P.S. I know it says "pressurized oil port" under the pic, but no luck finding exactly what that means. I can't see any sensors or wires coming from it on my truck.

2002 5.3 LM7 engine is the engine in question...Thanks.

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Thats the oil cooler block off plate. And yep, there's a gasket there.

 

It has a small gasket that can be replaced for cheap.

 

Yeah what they said. It's a somewhat oblong o-ring. You could probably just rtv it up

 

Cool. Thanks for the replies.