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Probably because you have a blown head gasket. Get a compression check done to be sure.

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Q: Why does the engine coolant mix in with the oil in a 1997 buick?
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Why does oil and coolant mix on the valve cover and not in the engine?

Oil and coolant should NEVER mix in an automobile. Can you be a bit more descriptive in your question? Im led to believe there is something wrong with your vehicle. I agree with him, if you have what you call a mix of coolant and oil on the valve cover you have an internal coolant leak you need to get looked ASAP. Oil and coolant do not mix anywhere, it's like if you put oil and water in a jar and shake it, it seems to "mix" but it really doesn't and it will separate when left alone. If you get too much coolant in the oil, it will take away the lubricating quality of the oil and it will ruin the engine.