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Its one of two things. First, either the intake manifold is leaking coolant between the intake and the head. The gasket is pinched in the driver side rear. or Its an oil leak from the valve cover at the passenger side rear. You can tell by the smell- it can either smell like oil or antifreeze steam.

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Q: What causes 1984 Oldsmobile ninety-eight to show smoke from top of engine when shutting off?
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