I don't have a diagram, but your problem is the oil cooler underneath the intake on top of the engine. Remove the intake, and the cooler is right there in between the heads. Easy to change once you get the intake off. This is a VERY common problem on Cateras, and the symptom of it is oil in your coolant. I have a 1998 Catera and had the same issue.
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Sounds like a head gasket failure, not a radiator hose problem.
Very important to answer this: Is the oil you see reddish in color or brown like from engine? Is there any coolant in your engine oil? While waiting for answer, do not drive it!!
more likely Curt Downs has right answer. When engine warmed little open reserver tank cap( very CAREFUL so much pressure) slightly open and close then you will hear whistle sound and coolant bubbles up that's the indication of head gasket is gone. Good luck!
I don't have a diagram but I'm looking for the hose that controls the noise coming from the manifold.
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