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There are two maintenance issues with the 3.8L W bodies I can think of off the top of my head.
(1) The lower intake manifold gasket tends to leak as the car gets older. Expect to pay ~ $400-$800 to have a shop replace it.
(2) The intermediate steering shaft has a tendency to make a tapping noise if it is insufficiently lubricated. You can pay $5.00 for a lube kit from GM, and it'll go away for a while. Eventually, when this stops working, expect to pay ~ $200 to have a shop replace it.
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