I have an oil leak coming from the top of the engine and I’m trying to determine if it’s possible for oil to come from a bad intake manifold gasket or if only coolant can come from that? It’s definitely not the intake plenum gasket as there’s no oil around that.
It’s most likely the valve covers but I’m trying to do my due diligence and make sure oil can’t come from a bad intake manifold gasket.
The camshaft is located under the intake manifold, there is oil under the intake manifold, the gaskets on each end of the manifold seal the camshaft valley of the engine.
The Chevy 3.4 intake gaskets fail and cause coolant leaks. I think the 3.8 motors had plastic intakes and metal intakes depending on versionS so it’s a bit different. I know the 3.8 had coolant elbow leaks forever.