oil cooler lines
cam cover gasket (very top of engine)
oil fill cap on cam cover
breather tube that runs from cam cover to center of air cleaner assembly
turbo wastegate tube (rubber tube runs just below and across the big plastic elbow from air cleaner to turbo inlet)
the oil drain tube that snakes from the bottom of the air cleaner assembly across towards the front of the engine by the turbo and then down into the oil pan on the turbo side of the engine

lots of little places to check - as mentioned - good thorough degrease and go from there

__________________
~shell
As of 2/2010:
2001 CLK55 0o\=*=/o0
13.6 @ 106mph
10K mi
1984 300SD
260K mi and going and going...
97 S600
46K miles
1991 Sentra SE-R (extremely dorked with)
www.se-r.net