I have quite a bit of the left side of my engine apart chasing down an oil leak that is coming from the oil filter area. The leak is rather bad, leaving puddles wherever I park and lots of drips from the underside of the car. Though I don't know the exact source of leaking, judging from the pattern I suspect it's either the oil pressure sending unit or the base of the oil filter housing where it bolts onto the block.

Has anybody seen an appreciable number of M104 engines to give an opinion as to the common source for leaks in that area? The head gasket was replaced at 59K, and it doesn't appear to be leaking from there. It's too dry at the head gasket.

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95 E320 Cabriolet, 159K