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Hi,
I had the same problem on my 98 S70 T5, except it was the other way around. Oil in the coolant, but no coolant in the oil. Mechanic did a pressure test and said it was the head gasket. Also that I was going to need a new turbo soon. So after many $$$ I got my car back and had the same problem. Turns out it was the oil cooler in the radiator developed a crack that only allowed a oneway flow as compared to a more typical two way. Flows one way when engine is running and hot, then the other way after engine is turned off (this is when the coolant has more pressure and can flow into the oil).
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