I have a fox body with a 5.0 and oil in the throttle body. I don't know how it gets there but it is messing me up. I run a vortech v-1 that spins 15+ psi of boost. There is no residue inside the sc head unit or in the pipe. It is not a blown seal on the sc. The PCV valve is fine as well. I suspect that the blow off valve is malfunctioning but I can't relate how that would leave me with oil in the throttle body only. If anyone has some suggestions as to where I should look next it is greatly appreciated.