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  #51  
Old 06-10-2015, 02:49 PM
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Quote:
Originally Posted by trader4 View Post
... your PCV design...
@trader4,

It is not "my PCV" design, it is BMW engineer's design. I have nothing to do with the design.

The X5 M54 CCV setup is dumb. This is because the Intake Manifold sits BELOW the valve cover. In the process of routing oil + vapor mixture, BMW likes it or not, the mixture settles at the Separator.
BMW engineers hope that oil being heavier runs down the other hose to the dipstick tube, while vapor is sucked into the I.M.

Nice thinking but in reality, some oil is sucked in the I.M.

The E53 M54 CCV setup is dumb from day 1. Too complex for a simple CCV issue.
In Honda car, is is a simple valve.
In the E23 from 1980s, it is a simple hose, as conceptually illustrated in the mod in this thread.

Again, it is NOT my design, it is dumb BMW design. Engineers sometimes go forward, and sometimes they go backward. The M54 CCV is an example of backward thinking.
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  #52  
Old 06-11-2015, 10:45 AM
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Quote:
Originally Posted by trader4 View Post
...You make it sound like the
oil separator just relies on gravity to separate out the oil...
trader4,

I don't make it sound like anything. I don't want to argue with you how the CCV works, you may want to do more reading on the engineering aspect of it.

Most of the oil will go down by gravity, a little bit of oil will stay around at the Separator. When the diaphragm opens, vapor will be sucked in and some oil will be too.

The analogy is: when you open a door to a building and some unauthorized person sneaks in at the same time.
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  #53  
Old 06-11-2015, 10:47 AM
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Quote:
Originally Posted by trader4 View Post
...All I'm saying is that
if you tear out the stock system and don't have that, you may wind
up with more oil going up that hose and into the intake than with
the stock design. It's essentially oil vapor and a foot of hose going
slightly up hill isn't likely to cause it to shed much oil, IMO...
WRONG, look at E23 PCV setup, it is precisely like what you said.
A simple hose slanting upward and that is it. See the photos I posted earlier on E23!!!
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  #54  
Old 06-11-2015, 10:56 AM
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Originally Posted by trader4 View Post
If you think having to add oil between oil changes is unusual with high mileage, 10+ year old cars, then you must have some exceptional vehicles...
My E39 1998 528i with 150K miles with M52 engines drinks no oil between 6K oil change interval. Nothing, zip, nada oil consumption.
Nothing!

M54 is another story...
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  #55  
Old 06-11-2015, 12:00 PM
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On the exact cause of M54 oil consumption, I don't know.

As I mentioned previously:
- My M52 1998 528i with 150K miles: zero oil consumption
- My M54 2006 X5 3.0i 5sp MT with 115K: 1 qt every 1000 miles or so.



I came across this video, take your time to watch it. Seems like piston rings issue:

https://www.youtube.com/watch?v=9Ze_qD22JiU



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  #56  
Old 06-11-2015, 05:44 PM
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The M54 engine has low tension piston rings, and once the rings start getting clogged with carbon buildup the engine will start using more & more oil (this might be one reason why some people mentioned after 70 k miles, the car started to use oil - my e39 did the same thing).
using the PCV will increase vacuum, and the apparently the scavenger rings somehow will perform better and hence no or very minimal oil consumption with this setup (CCV). However, it is unsure how long the engine will last with setup. Poolman on the e39 board had a catch can setup, and one piston had burnt valve(s) after driving a few years with no oil consumption. Not sure if it's related to higher vacuum.

However, on another e39 board, O2Pilot introduced another mod using the OE CCV system, by introducing another hose between the plugged off CCV nipple & plugged off intake manifold nipple (back of the engine).
This is the whole post, the fanatics guys always refer to (they use this mod), and post #74 has the resolution. The whole thread (looong) is worth a read.

Also, below is how the M54 pistons look once they start getting clogged with carbon buildup. the user Mlody from the fanatics has an outstanding post about this, and his battle to clean the rings in order to reduce oil consumption. Here is his post

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  #57  
Old 06-11-2015, 07:28 PM
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^Great post Dorin, I already use Rotella T6 which has a decently high detergent amount since it is formulated for gasoline and diesel engines and my consumption has slowed down considerably since replacing the CCV last June, my last oil change was performed in December (I don't drive the X more than 10k miles per year). I also add Lucas Upper Cylinder lube frequently and am hoping that also contributes to keeping gunk buildup off the pistons.
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  #58  
Old 06-13-2015, 07:07 PM
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Well just completed this mod and I'm a bit concerned - vacuum increase is HUGE compared to before. It's enough to collapse the hose coming out of the PCV valve slightly. I mounted the valve vertically with a loop of 3/8 inch hose. There is so much vacuum I can barely get the oil cap off - much different than this morning prior to the change.

I will say the CCV I think was the original from 13 years and 138K miles ago, so it may not have been working as new.

For those that have done this - did you see a tremendous vacuum increase?
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  #59  
Old 06-13-2015, 07:23 PM
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Same here. I did noticed significant vacuum increase at idle. However I didn't notice any negative effects from it. It is over 2200 miles with the mod. No issues. Oil level remain at the MAX.
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  #60  
Old 06-14-2015, 01:35 AM
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Just did the CCV the "Stock" way simply because I need to replace the OFH gasket (leaking like crazy at 116K miles), and since I already bought the CCV parts.

At 116K, surprisingly, the stock CCV is still OK, dipstick no blockage at all. Probably because the was had highway miles and not stop and go. So I replaced all factory CCV parts. It took the whole day because of the OFH job in addition to CCV DIY.

Coming from E23 (1983 735i), which has a simple tube slanting upward (the I.M. sits above the M30 engine), the BMW M52 and M54 CCV engineering design is absolutely stupid, cannot believe the German engineers designed this stupid thing.

At the next CCV job 100K+ from now, I will do the mod as outlined in this thread, which is better, cheaper and no fighting with nuts/bolts and convoluted factory setup.
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