2000 Mercedes Benz ML430

Engine Mechanical problem
2000 Mercedes Benz ML430 V8 All Wheel Drive Automatic 118000 miles

I have noticed a small what looks to be oil drop on the driveway. I looked under my car and noticed fresh oil on the engine part directly behind the oil pan. I dont know what it is called but has a big allen bolt holding it to the engine. The part looks like it is two pieces put together, silver in color and looks sealed by black sealant instead of a gasket. What is the name of this part, and what could be leaking oil.
November 1, 2009.

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