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Blinkwatt... by Oil Filler Tube, he means...Oil Filler tube. Its the tube that connects the engine block to the Oil Refiller Cap in your trunk, and yes it will cause a vacum leak. Typically a Turbo or supercharged car has one-way PCV (Pressure Control Valve) to prevent vacum leaks that sometimes push your dip stick up outta the housing.
I wonder if the Breather vent for you engine crankcase has a PCV or just a tube leading to the intake manifold like any other N/A motor would have. The boost pressure could be filling your crankcase and possibly causing your oil filler tube to be spit out while under boost.
The PCV would prevent the boost from shooting into the crankcase under boost while allowing the vacum pressure to suck out the gases that hot oil emits during operating temps during idle.... Helps maintain oil viscosity. Its basically a 1 way valve.
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