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The plenum plate sits underneath the intake manifold, and it has a gasket that sits between it and the manifold. Dodge messed up by putting a cast iron plate under an aluminum intake. Well in the winter, the temps fluctiate so much between the two metals that the gasket eventually ruptures and lets oil leak through into the manifold. In time it causes power loss and other problems. The best way to tell if your plenum is blown is to look down the throttle body and if their is oil pooling then you got a blown plenum. The fix is a new ALUMINUM plate to put in place of the old cast iron one so that the gasket will stay in place and not rupture. In terms it gives you better fuel mileage, performance, and takes away the potential of your engine blowing up.
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