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As mentioned, the froth was probably caused by cold weather affecting the dipstick tube. If the weather has recently warmed up in your area and it coincides with the froth disappearing, IMHO, that confirms it is a cold weather moisture issue. That is exactly what happened in a couple of winters to both my 240 and 850 years ago.
Based on the age and mileage of your car it is makes sense and is good preventive maintenance to go ahead and overhaul the PCV anyway.
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Will I buy another Volvo??? We'll see....
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