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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 02-06-2014, 11:22 PM
Smalls1000 Smalls1000 is offline
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Question Oil in intake manifold

I've heard of the issue where people get oil in their intake manifold, but I know you shouldn't get oil in there. The closest I've ever had to an issue like this is oil getting into a cdr valve on a diesel engine. Can anyone explain how oil gets into your intake manifold and why?
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Old 02-06-2014, 11:40 PM
CitizenOfDreams CitizenOfDreams is offline
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The gases from the engine crankcase are intentionally sucked into the intake (read about positive crankcase ventilation). Those gases contain small droplets of oil. The oil is separated and returned back into the crankcase, but some amount still makes it all the way into the intake manifold. When the oil separating device goes bad, the situation worsens.
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Old 02-07-2014, 03:04 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Smalls1000 View Post
I've heard of the issue where people get oil in their intake manifold, but I know you shouldn't get oil in there. The closest I've ever had to an issue like this is oil getting into a cdr valve on a diesel engine. Can anyone explain how oil gets into your intake manifold and why?

As well, turbo can leak oil.
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Old 02-07-2014, 05:39 AM
Phil325i Phil325i is offline
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Plumb in an oil catch tank.
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Old 02-07-2014, 08:03 AM
jburke4689 jburke4689 is offline
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Some oil is normal. A small amount of oil gets past the turbo seals and a small amount of oil goes a long way.
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Old 02-07-2014, 08:54 AM
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An OCC is worth the time & effort to install. Will help extend the clean the valves interval.
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Old 02-07-2014, 01:22 PM
Smalls1000 Smalls1000 is offline
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I think I'll get one of these oil catch cans then
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Old 02-07-2014, 01:35 PM
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thekurgan thekurgan is online now
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Quote:
Originally Posted by Smalls1000 View Post
I think I'll get one of these oil catch cans then
I doubt it will catch much, actually. What you are seeing is eventually causing the excessive carbon buildup I believe.
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Old 02-07-2014, 01:41 PM
Smalls1000 Smalls1000 is offline
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I doubt it will catch much, actually. What you are seeing is eventually causing the excessive carbon buildup I believe.
What do you mean?

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Old 02-07-2014, 01:44 PM
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thekurgan thekurgan is online now
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Originally Posted by Smalls1000 View Post
What do you mean?

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The entire thread is interesting, but I don't see this being helpful.

http://www.bimmerfest.com/forums/sho...9&postcount=43
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Old 02-07-2014, 05:00 PM
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Quote:
Originally Posted by jburke4689 View Post
Some oil is normal. A small amount of oil gets past the turbo seals and a small amount of oil goes a long way.

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All the way to the intake valves....
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Old 02-07-2014, 06:02 PM
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in my opinion every high compression engine should have a factory intake runner port set up for periodic intake and valve cleaning ,, ie every 15k or so.
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Old 02-07-2014, 06:36 PM
jburke4689 jburke4689 is offline
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in my opinion every high compression engine should have a factory intake runner port set up for periodic intake and valve cleaning ,, ie every 15k or so.
Then you would have to admit it is a problem!

Who is going to do that?
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