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It has been my experience that the PCV system is letting to much crankcase pressure to build. Find a shop that is familar with how the system works other than just replacing the valve and have them check it. It is a very RARE case that my shop ever replace rear main seal IF the PCV system is doing it's job.

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Q: What could cause wetness in a 2003 Chevrolet Impala oil pan gasket and main seal?
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