[92Deville]

How common were oil leaks from the intake manifold on a 4.9L? Or would the more likely place be the valve covers?

 

[Night Wolf]

So common that I have yet to hear of an intake manifold leaking oil on the 4.9

valve covers.... I have heard a couple cases, hardly any at all though.... so I would say uncommon, thats not to say it dosn't happen though

 

[91TexasSeville]

The most likely source of oil pooled on the intake of a 4.9L manifold is from the power steering pump.