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Q: oil leak? on 2010 Chevrolet Cobalt

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I am finding a very small amount of oil that seems to seep from the top of the engine. It is not near any gaskets or screws, etc. I clean it up and in about 1-2 weeks it is back. Is it possible to have a micro crack in the aluminum cover that allows this to happen? Will the dealer believe me and fix it?
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Just take the car back to the dealer and say it has an oil leak, please repair it under warranty. Take a sample of the oil left on the floor in with you.
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