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Possibly head gasket, cracked head, damaged piston rings, or even a leak in your coolant hoses or oil lines.

more likely to be the upper intake manifold, common issue, its plastic. all 3800 series 1 + 2 seem to experience this at some point in time.

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Q: 2001 buick lesabre with the 3800 series II engine and it has started using a little bit of oil and coolant all of a sudden.I add approx 1 quart each every 1000 miles?
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