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  #1  
Old 09-24-2009, 11:59 AM
mmcgrath9873 mmcgrath9873 is offline
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Location: Michigan
 
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Mein Auto: 2001 740 IL
2001 740iL oil burn

Looking for input. I just purchased a BMW 740 IL. The vehicle has 70k miles on it. It seems to be burning oil. Is this normal? Does anyone have any advice for me around oil types or weight to help mitigate this problem.

This is my first BMW and I love the car. Want to make sure it will last a while. Thanks in advance folks.

mjm
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  #2  
Old 09-24-2009, 06:06 PM
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crewdog843 crewdog843 is offline
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Does it burn oil constantaly, or only at start up?

At 70k miles, your car is considered low mileage, and unless the previous owner beat it to death, there will be little wrong with the rings to cause oil smoke.
In fact, one almost never hears of a 740 smoking because of rings. You can do a compression test, but you will probably find all cylinders are withing spec.

Oil smoke is bluish white, different from water vapor, which is white. Gas smoke (rich) is grey.

A simple test: With the engine running, pull the dip stick and place your little finger over the entrance to the tube. Do you feel strong suction, do you hear a gurgling noise? If the answer is yes, you are probably looking at a defective OSV (Oil Separator Valve) at the rear of the intake manifold, back by the firewall. To nail it down, take it to BMW or a certified independent familiar with German machines, and have them do a 'slack tube manometer' test which will tell you once and for all.

Not a difficult fix, but one requiring the proper tools in tight spaces. If you have them do it, have them check your valley pan gasket while they have the intake manifold off. Best to do it at the same time if it shows signs of leakage.

jake
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  #3  
Old 09-25-2009, 01:06 PM
Daytona_BMW Daytona_BMW is offline
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Mein Auto: Bimmers are sold :(
Do you have a little dot that is illuminated next to the trip meter in the instrument cluster? Right where it says miles.

It's called a manipulation dot, and will illuminate if somebody has tried to fix the mileage of the car.

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  #4  
Old 09-26-2009, 08:02 AM
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crewdog843 crewdog843 is offline
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Ummmm, Daytona....not germane to this particular thread.

jake
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  #5  
Old 09-29-2009, 02:39 PM
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CodyItaliano CodyItaliano is offline
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Mein Auto: 2001 740i
from many others, i've heard about an oil separator valve that goes bad or gets clogged and will cause this excess oil to be thrown into the intake then being burned off in the cylinders. which there you'll see that smoke. also, my E38 had a problem with some kind of Lambda valve, not sure if thats right but it was something specific on the 4.4. must have to do with the initial startup and the oxygen sensors. other than that, its rare to have a bad 4.4 engine. everyone says how reliable they are, these are other owners i know with E38s.
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  #6  
Old 10-04-2009, 09:45 AM
All2kool All2kool is offline
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Quote:
Originally Posted by crewdog843 View Post
Ummmm, Daytona....not germane to this particular thread.

jake
Ummm....Crewdog...it certainly is if the cars' miles have been changed from 170,000 to 70,000.
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  #7  
Old 10-06-2009, 10:22 AM
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synenergy52 synenergy52 is offline
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Mein Auto: 330i
^^ I agree. Crewdog, get real
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  #8  
Old 10-07-2009, 09:40 AM
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crewdog843 crewdog843 is offline
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Sorry, I did not see a reference to 170,000 miles, only the 70,000. Didn't look like the OP edited the thread, but maybe I missed something. Wonder why the OP has not come back to us.

jake
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