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Only one side is smoking?
From what I remember the oil seperator would make both banks smoke since the intake manifold is shared by both banks on the v8.
Or maybe it just leaks into one side better. 
Also check hose 4 and 5
RealOEM.com * BMW E53 X5 4.4i Crankcase-Ventilation/oil separator
Those need to be replaces about every 3 years.
Luke
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Luke
95 525ia
01 X5 4.4
1965 Pontiac Lemans Convertible (resto mod)
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