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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 07 323i Oil Consumption, Crankcase Ventilation?



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      10-12-2015, 01:11 PM   #1
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07 323i Oil Consumption, Crankcase Ventilation?

I have a 2007 323i (Canadian) 6MT with 122000km (~76000 miles), that I bought a few months ago. In general, the car runs and drives great, but consumes about 1 liter of oil every 2000 km (~1qt every 1200 miles). The engine has no visible oil leaks, or at least none near the oil pan, oil filter, and valve cover.

I'm starting to think that the oil consumption issue is related to crankcase ventilation. While the engine was warm and running, yesterday I tried opening the oil cap, and noticed some vacuum, and a sucking sound as I opened the cap. With the cap open, I could also hear some "gurgling" coming from underneath the valve cover. Also, sometimes when I start the car, it will initially have a bit of a jumpy idle (~50 rpm fluctuations, and very mild shaking) for maybe 3 seconds, but then clear and run fine. Lastly, a few weeks ago I was detailing the engine bay, and decided to remove the plastic engine cover, and then remove the #1 spark plug. The plug looked very good, and not fouled at all.

I've read a bunch of threads about similar issues, but I'm not exactly sure which engine parts (I'm assuming crankcase ventilation related parts) I should try to change, or in what order I should change them. From what I understand, the "oil separator" is build into the plastic valve cover, meaning that the entire valve cover should be replaced if the oil separator is bad. Is this true? Does anyone know definitively what parts I should start replacing? Thanks for the help, and for reading through a long post!
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      10-12-2015, 01:34 PM   #2
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Oil filter housing is the most common spot. You won't drop, but it will absorb around it.
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      10-13-2015, 10:06 AM   #3
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If there are no leaks don't worry about it, 1L every 2000kms is "normal".
These engines will eat up a bit more oil due to their low friction piston rings.
Just make sure you redline it now and then to keep things smooth.
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      12-03-2015, 04:33 PM   #4
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I just got word from my SA today that my crankcase ventilation valve went on my '07 323i. Got the yellow engine dash symbol while on a long distance road trip. It was strange that my wife heard a wheezing noise from the passenger side seat but I couldn't hear it.
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      12-03-2015, 04:59 PM   #5
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1QT every 1200 miles sounds about right to me. I have a leaking oil filter housing gasket though, but it isn't losing too much oil as of now. Something I'll definitely be fixing soon though.
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      12-04-2015, 04:01 PM   #6
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How often do you change your oil?

Any short journeys?
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      12-06-2015, 01:08 AM   #7
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Oil filter housing gasket is a common leak, as is valve cover gasket.

Car will still eat some oil between oil changes.

If you're in GTA and need a good mechanic, look up Leslie Du in Markham. Paradigm performance I think.

Knowledgeable, friendly, and affordable.
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