There has been a lot of discussion here about the oil consumption issue and I thought it would be a good idea to get all our opinions and discussions and DIYs into a single thread.
From what I have read, heard and experienced, it seems the oil consumption on the M54B30 engine can vary from zero consumption to about a quart every 500 miles. The oil consumption seems to be present mostly on engines which have over 100k miles on them AND more importantly for a lot of folks the oil consumption seems to have gotten worse and/or started after the CCV has been replaced (for me too personally). There has been a lot of discussion on this issue on various forums, but this seems to be the most comprehensive -
http://www.bimmerforums.com/forum/sh...8#post23714558
I forgot who posted the link on an another thread, I just bookmarked it for my reference, so a BIG Thank You to whoever it was. The thread linked above talks about the "O2Pilot Mod" which is named after the person who came up with it. It basically involves connecting the port on the oil separator to the port at the back of the intake manifold using a simple vacuum line. The mod seemed to have worked for a lot of folks, with some reporting near zero oil consumption with no side effects, but slater (peter) pointed out that there could be a possibility that condensation could enter the intake manifold through the vacuum line and possibly hydro lock the engine.
I recently found a video on YouTube by 50sKid, which in fine detail explains everything we had been discussing as well as possible solutions to cure the oil consumption including the O2Pilot mod -
https://www.youtube.com/watch?v=NYp3ieMy5oI
Also here is a video of the O2Pilot mod DIY by 50sKid -
https://www.youtube.com/watch?v=Fo2rLSzNzt0
Obviously there is a lot more information I can add to this post but for starters I just wanted to create thread where we can all discuss the issue instead of in a random thread where it would be difficult to find later.
I would also encourage others to add anything related that you might think is interesting, important or necessary
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