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This is Alfa Romeo Giulietta installed oil separator. Disassembly shows the vent is guarded by a flat rubber circle pushed up by a spring. This rubber flab probably ensures the air only flows in. Other than that the separator is connected to the engine block for oil to drip, and has two hoses: one leading to the intake hose before turbo charger and the other probably to the crank case. Why would it have this vent in the cover?

oil separator

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If the cover did not have a vent, then the membrane could only move if it compressed the air enclosed or caused a depression relative to atmospheric pressure which is not the effect the desingner / manufacturer was wanting...

  • Sorry, I think I misnamed the thing. It is not really a membrane in the sense that it filters things, it is a large flat rubber sort of gasket that ensure the air can only come in not out. I don't think it is there to separate the oil. I'll edit the question. – luntain Oct 18 '18 at 17:50
  • A membrane does not have to be a filter... It may just be there to stop dirt ingress... – Solar Mike Oct 18 '18 at 17:52
  • Still don't understand your answer. The air is supposed to flow from the crank case through the separator into the intake. What is the vent for? – luntain Oct 18 '18 at 17:55

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