I was a tech for GM for a few years and we had a motor that was in all the early 90's cadillacs called the 4.5. I would warp it's head's under high heat conditions and allow the coolant and oil to exchange through the now leaky gasket. Meaning usually that you had coolant in the oil. This in turn causes great lower bearing damage, and other parts that would not normally have access to water to rust. In almost every instance the engine would have to be replaced. Granted I know nothing about Saabs, but I have seen this on a few cars other than just GM.
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