A few questions:
1. Are you hitting those speeds on public roads?
2. What made you think you were sucking oil out of the engine?
3. Why did you disconnect the PCV system? (At high engine speeds, where is the increased volume of "oily byproducts", generated by the crank flying through the oil, going since there is no vacuum to open or close the PCV valve?)
I can see the advantage of disconnecting the PCV system but if you left the stock PCV valve in place then all that byproduct is trying to force its way up and out of the valve cover. If you don't want to get a PCV valve delete plate then you can gut the stock PCV valve (See sporadic's first turbo build thread).
2004 SVT: bewst'd!
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2013 Escape SEL 2.0 Ecoboost 4WD
2004 F350 6.8L V10 4x4
1986 XR4Ti 2.3L Turbo, 15 psi