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I have a mercedes m273 e550 and I get a whistling noise that comes on and stays on randomly while the car is running. Also I think there is excessive pressure in my crankcase. I changed the intake manifold and the pcv valve and oil drip pan behind the camshaft but still have this noise. Could it be the much simpler oil seperator/pcv valve on the front of the valve cover? This part seems really simple and it has a hose that runs to the intake. I don't really even understand what it does but looks like a plastic case with a number of channels inside of it.
What about "the milkshake" in my PCV and Crankcase Vent Valve?.. I have a rough idle so I started with these two parts to see if that would help and I noticed white sludge.