oil in egr valve

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2001 Odyssey 3.5. Getting P0401 EGR Flow. Found some oil in the square port of the EGR valve / thermostat manifold. Also there is air passing between square port and round port of same, when air nozzle is used to blow through round port. Are the two ports supposed to communicate or has the manifold cracked or corroded. Where is the oil coming from? Im going to replace lower intake gasket.

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