I had the exact same thing on my old s60 03 d5 with 190000 on the clock it was the head gasket that had gone but didn’t want to spend the money on it. Two bottles of steel seal in it and it sorted it took about 3 weeks and all the pressure had gone from it and I ran it for a year until I chopped it in. I’m not a fan of bottle fixes but it did work and really well.
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