I have oil in my intake, more than I would expect......actually quite common with the newer mustangs. Compression and leak down test we're good/great. Only 35000mi! It seemed to have more pressure out of the passenger side(befor throttle body) than the driver side(manifold) I ran straight breather caps on the valve covers and played with the manifold port as that was more than twice the size of the other one(befor tb) by played with I mean put a breather filter there too and watched o2's and fuel trim until I was close to stoikeometric air fuel ratio! I noticed that the filters on the valve covers would start to get saturated in oil and eventually start dripping. I changed it back to get my car smoged and want to do something similar. I was thinking of just putting an inline water/oil separator (I know there is no water.....air will flow through it just fine) because they are not too big and can be installed and monitored easily and there cheep. Has anyone done this? Sounds like a good idea but would like feedback?