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I second this. I recently bought an 89 244 with 195K on it when the odometer broke (true mileage unknown), and it was an oily mess under the hood. First step---wash the engine, after which I observed oil coming from the filler cap, despite its having a decent rubber gasket, and also running down the side of the block below the separator box. While tracking down an idle problem (which turned out to be due to an incorrectly adjusted linkage rod) I discovered that the throttle body was absolutely disgusting, and the intake hose was full of oil. After cleaning those, I decided to see what I could do about the rest of the PCV system. I found it almost exactly as you describe. Nothing was completely blocked, but it all had a heavy buildup of black sludge. I cleaned everything out as well as I could, installed a good used flame trap from another car, and put it all back together. The engine now idles perfectly, and no longer leaks oil. A new seal under the oil separator was an important part of the equation, as was reaming out the hoses and the outlet on the top of the separator, which was probably 40% obstructed. I did not have to remove the intake manifold, though it was a bit tricky to get the separator box out and back in---you have to tilt it at just the right angle or it won't go. While the separator is out, shake it. If it rattles, keep shaking until all the loose debris comes out. It is also a good idea to clean the idle stabilizer (air control valve) and its hoses at this time.
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