My guy just replaced my Oil Seperator and lines yesterday. I'll take pic's tomorrow and post them (I took the old parts and hoses) There was gunk at the bottom of the seperator that I could see. The hoses were toast of course. The part is cheap and after seeing the crap the accumulated at the base of the part, its worth spending a little more to have it replaced.

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2001 4.4i Alpine White-Bone Stock
2001 Discovery II SE7 Black (A money pit)
1996 FJZ-80 Black (with some goodies)
1969 Firebird (work in progress)