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Yes I agree it could be head gasket but more likely the head is cracked. There is only one passageway to the head through the gasket for oil under pressure and of course a return path for the oil to drain back. If the gasket is blown through at this point to a nearby water passageway in the gasket then oil in coolant and possibly colant in the oil would result. But it is also very likely that the head has cracked and oil is flowing into the water jacket internally. I am not trying to be pessimistic but that was my experience. I was able to purchase a used head from a Volvo shop.
The cause of my problem was a bad overheat episode. Had low compression on 1 and 2 and could see damage to the gasket between these cylinders upon disassembly and some warpage. There was no apparent degradation of the gasket at any other point. I had oil in coolant so therefore my assumption was cracked head. BTW the block rarely rarely will ever crack.
As I said you can get the head checked at a machine shop. I opted to just buy one because i trust the owner of the Volvo shop when he said it was good and the price was right, around $150 I think. I checked the valve clearance on the head to be OK, installed new cushers under the buckets, put in a new front cam seal installed it and it ran like a charm.
Good Luck
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