When i got the milky residue on my oil dip stick (S70 1998 T5) it was related to the PCV system being blocked. The dip stick was push out of his position in the tube after extended driving. To much pressure from the crankcase caused it. Water was condensing inside the tube. It was winter time and cold. Check the oil vapors recirculation valve at the turbo inlet for blockage, the oil separator box under the intake manifold and the rubber vacuum connection on the left hand of the intake manifold near the power steering pump. Mine had become soft with oil contamination. See FCP Groton for a kit to replace/renew the system. If not taken care of your RMS can suffer and you may get in real trouble. I do not beleive the problem is related to antifreeze. You can see many treads on forums covering it. Since i change the oil separator, the lines, clean up the valve, my pressure when down to normal. One good indicator of this problem is oil accumulation under the spark plugs cover caused by to much pressure.