OSV vs Oil Separator - Bimmerfest - BMW Forums

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Old 02-25-2010, 05:13 PM
pbstrickland pbstrickland is offline
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Location: Franklin, TN
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Mein Auto: 2001 740iA Sport
OSV vs Oil Separator

What is the difference between these two, I replaced the OSV and now I read about the oil separator which seems different. How do I replace that? is it a big job?
Old 03-02-2010, 02:16 AM
Beemaboy Beemaboy is offline
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Location: South Africa
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Mein Auto: 320I, 525I and 740I
The OSV sits on the back of the manifold and just has a valve in it that regulates the pressure of the manifold...
The actual oil seperator sits down inside the front of the engine. As far as I know, you have to remove the timing cover/timing chains to remove this. I had it replaced when I had the headgasket done on my car...

Item you are talking about is number 1 in this diagram and sits at the front of the engine...
1987 E30 320I M20 Manual
1995 E34 525I M50TU Auto
1998 E38 740I M62 Steptronic

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