I have a 77 bronco with a 5.0 efi engine from a 97 Ford Explorer. I noticed there is oil in the cold air intake area and upper intake manifold. I was checking on things and noticed oil around the PCV valve and on the outside of the cold air intake system. Should I be concerned about this? I have done some research. I checked the PCV valve and intake manifold gasket which appear to look fine. The PCV valve rattles and the gasket is intact. Granted there isn’t a lot of oil when I looked inside the upper intake manifold but thought I should write and ask if this is a problem or not. Should I just replace them pcv valve any ways and recheck it after driving it for a few miles? The explorer did have 110K on it but when we took it apart we thought the engine looked great for how many miles it had on it. We did change out the cam and timing chain but as far as the other parts, we did not replace.
I am also getting a unusual reading to not reading with my oil gauge. When driving for a about 30 minutes or so, My oil gauge goes down to zero when I’m stopped but when I’m drive off then the pressure comes back up. When I have it in park the gauge reads fine. Any ideas why this is happening?