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Both the 3.1 and 3.4 engines in these vehicles have intake manifold gasket leaking problems. Sometimes the leak allows coolant to flow into the engine. But if it's leaking up front, oil leaks out and drips down the front timing chain cover. At first glance it appears like it's an oil pan leak. But if you spray it down with cleaner and check again, you'll see that the oil is coming from above.

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Q: Why does my 2002 grand am leak a ton of oil sitting overnight?
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