actually it is no use for us to write in English or Swedish since I am German (living in Norway) but it might be a bit boring for all the other Saab enthusiasts.
To your problem. I have a copy of the original Ford service manual for the 12/15m. This says that you shall use fluid seal under all screws / nuts from the intake manifold. You shall also use the seal on the kork parts of the gasket, it is not clear if on both sides, the text says ’use fluid seal on the head’. Are you sure that you have installed the plastic washers under the 2 screws (the side where the oil filter is) from the oil-sump (ölwanne)?
I have a .pdf copy from that manual but I don’t know how to post a .pdf file here in the forum. Can somebody help me with this?
Best regards and viele Grüsse, Rolf