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The best test is to perform a compression check on each cylinder. A low reading on any one will indicate a leak. If the gasket is blown between two cylinders, both cylinders will have lower readings than the others. You can also check if there is water in the oil pan by checking the dip stick. This is only helpful if the leak is to the water jacket. Knowing why you suspect a head gasket problem would be helpful in determining the cause.

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Q: How do you know if you need a new head gasket in Buick regal?
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