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You think 928's have oil in the intake. Check out this intake from a Mercedes 190D I am getting on the road.
Eat your veggies!
Tha's normal for a diesel and actually not that bad. My DD TDI only had a dime sieze opening left when I cleaned it up. It's not engine oil but oil from the exhaust that causes this. Block off the EGR system and it will save you from constantly cleaning the intake. There is a very simple way to clena this, using a propane torch and some compresses air.
Attending to my monthly charging duties. It is 9 degrees outside so "topping off the charge" is a good idea. Last time it ran was late the fall of 2011.