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  #251  
Old 10-02-2013, 02:24 PM
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Quote:
Originally Posted by Doru View Post
This is a very sensible observation. If we can change the corrugated hoses with smooth hoses that won't collapse if vacuum is induced, the oil will not stay trapped in there. Maybe in very cold environment, the hoses don't warm enough, and there is more and more oil trapped in there (getting thick with cold), until it discharges at once?
You made the observation that the transparent hoses do collapse slightly. Maybe some PVC hoses attached to the OEM nipples?
Eventually I'll switch to a permanent smooth hose assembly if need be. The hoses appear to hold up well and it's nice to see what's going on in there. I'm also experimenting with different configurations. I don't think I posted this photo here, but this is the hose assembly with a makeshift catch can (U shaped tube - right to left at T-fittings) to measure oil caught while driving.
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  #252  
Old 10-02-2013, 03:04 PM
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I like your "catch can". It also seems you have the updated valve cover? If so, what's the benefit over the old one (if you happen to know how the old one is)? I have the old config with both valves on each cover.
Also, if you have the updated cover, does only 1 have a valve (driver side)?
I am not sure if I want to change to the updated design & winter setup. The cost is quite high even for only 1 cover. Plus the hoses.
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  #253  
Old 10-02-2013, 04:37 PM
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Quote:
Originally Posted by Doru View Post
I like your "catch can". It also seems you have the updated valve cover? If so, what's the benefit over the old one (if you happen to know how the old one is)? I have the old config with both valves on each cover.
Also, if you have the updated cover, does only 1 have a valve (driver side)?
I am not sure if I want to change to the updated design & winter setup. The cost is quite high even for only 1 cover. Plus the hoses.
It's not updated - I have 1 CCV valve per valve cover (2 total)
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  #254  
Old 10-08-2013, 01:30 PM
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I stumbled on this vid which tackles the "low oil pressure" light. Apparently there is a bulletin on the oil return check valves. In the vid they describe how the valve end is made out of plastic, and they said that these return valves fail either by sticking close or by loosing the plastic valve cap (crumbles) - that's when the low oil pressure is triggered. Wondered if these valve caps start sticking, will they trigger high oil consumption and/or the blue smoke? if yes, that would be an easy fix (somehow).
Could anyone elaborate on this?

N62 BMW V8 Oil pressure light coming on 745Li 750Li 545i 550i - YouTube

The p/n is: 11367539857 , ECS Tuning has it for 19.69/piece this is the pic from their site:

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Last edited by Doru; 10-08-2013 at 01:36 PM.
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  #255  
Old 10-08-2013, 04:43 PM
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My blue smoke started right after I towed a heavy boat up a huge long hill, floored the whole time. I'm thinking since one of my CVV's was torn, I worked up some crank case oil into my intake & it took a few hundred miles to drip into the combustion ports and burn away, cause it's not smoking now and I have no further oil consumption. I'm still running heavier oil but will change it out to the standard 5w-30 in December when she's due next. Hmmmm.
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  #256  
Old 10-08-2013, 09:27 PM
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Quote:
Originally Posted by Doru View Post
Could anyone elaborate on this?
Sure. The oil return check valve is in the oil circuit, with no connection to the intake manifold and/or combustion chamber. When the check valve fails, the oil leaks down into the oil sump on shutdown. It doesn't go into the intake tract.
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  #257  
Old 10-08-2013, 09:36 PM
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Quote:
Originally Posted by Porschesolutions View Post
My blue smoke started right after I towed a heavy boat up a huge long hill, floored the whole time.
When you have it floored, you will have the lowest possible level of manifold vacuum. If vacuum is pulling oil into the intake tract that is the least likely time for it to happen. When you are going down the same hill with your foot off the throttle you will have the highest vacuum. If it is vacuum pulling oil in, that is when it will happen.
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  #258  
Old 10-09-2013, 10:41 AM
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Quote:
Originally Posted by JCL View Post
Sure. The oil return check valve is in the oil circuit, with no connection to the intake manifold and/or combustion chamber. When the check valve fails, the oil leaks down into the oil sump on shutdown. It doesn't go into the intake tract.

Thx JCL. Makes sense.
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  #259  
Old 11-23-2014, 04:18 AM
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I have a 07 4.8 x5 with 71k. Mine is doing exactly same. After idling for 5 minutes
It blows out white smoke once i rev it up and then It takes another 5 minutes and
Another rev for the smoke to show up. Smoke smells like a burnt tire.
I would be 100% sure i had leaking v seals if it was not for this one strange thing:
If i idle it with oil dipstick removed then it does not smoke anymore.
I changed ccv pipe and ccv valve membrane and it did not help.
Since it does not smoke with the dipstick removed i think its a ccv
Related issue and not leaking valve seals. What other ccv components
Can i change? Any ideas?
Thanks.
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  #260  
Old 11-24-2014, 11:54 AM
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you're correct: a few of us have narrowed this odd occurrence to a leaking intake manifold seal(s). If the dipstick is removed (good logic to follow there), there's another air intake source for the leaking crank case to draw from.

Apparently if the intake is leaking, vacuum draws leaking oil (from the crank case) into the intake system where it apparently ponds over +20-30 seconds until you mash the gas & an influx of air sucks the oil into the combustion chamber resulting in the oil & smell.

Thicker oil will help reduce the oil being sucked into the intake and the reason this happens at idle is because vacuum is at it's highest and that air flow into the engine is at it's lowest. Punching it after idle drastically changes air volume into the engine which sucks the oil into the ports.

You need to spend a few hundred & have your intake manifold re-sealed (removed & replaced).

People spend thousands on having a valve job which also fixes the problem...why? Because you have to remove and reseal the intake as part of that process.

Mark
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