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Old 06-10-2015, 11:15 AM
cn90 cn90 is offline
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Location: Omaha, NE
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trader4,

I am talking about brand-new stock system from showroom. From an engineering standpoint, E23 is more simple than M52/M54 setup.

1. In the E23, the mixture of oil and vapor goes up the slope (the simple tube). Vapor keeps going up while oil, being heavier, drips back down the valve cover area.

2. In the E53 M54 setup, the Intake Manifold sits LOWER than the valve cover.
So the mixture of oil + vapor goes DOWN the slope and pools at the Separator area.
In theory, oil being heavier goes down the dipstick housing and vapor gets sucked into the Intake manifold.
However, when the membrane opens up (under certain vacuum condition), some oil gets sucked into the I.M.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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