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Old 02-03-2008, 09:14 PM
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Originally Posted by fast4d
a valve cover leak would be easy to trace visually. with the help of some lighting look up or down the sides.
Right...use a flashlight look all around them front and back...If it is a valve cover leak then thats usually one of the common symptoms for the begining of a failed/failing oil seperator..
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Old 02-04-2008, 12:43 AM
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I have seen this leak in my X, and it seems to come from the power steering reservoir -check your power steering reservoir (under, to the left of the Expansion Tank) for leaks or the power steering hoses coming off it. I replaced the O ring on the reservoir cap, but have not checked lately for leaks. It may help to remove the plastic undercover to check - you will easily see it (use flaslight).
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Old 03-30-2010, 03:54 PM
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So did anyone find out what the problem was? I think I have the same problem lately. I don't see any drips on the garage floor, but I see the oil collected on the same parts. Plus, I get a oil burnt sent when I shut off the X in the gargage after I get home from work... Any input? I would like to resolve this small or big issue. Thanks.
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Old 03-30-2010, 03:56 PM
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And one more thing, my vavle covers have been fixed 3 months ago, oil sep is not the problem, I had my mechanic check all and he feels it may be the head gasket? I hope not....
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Old 03-30-2010, 05:26 PM
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Originally Posted by footsurg View Post
I seem to be leaking a small amount of oil out of my 2002 X5 4.4i. For the longest time I thought my engine was consuming oil because I kept finding it a quart low every 2-3 thousand miles. I never noticed any oil on my garage floor so I assumed the motor was eating the oil. While changing the oil this afternoon, I noticed something I had not seen before. There was a few drops of oil clinging to the bottom of the strut that bolts on to the oil pan. There is also a tube that is next to the strut that has a heat shield around it. This tube goes deep up into the motor. It seems that the oil is travelling down this tube and is ending up as drops on the strut and oil pan. Once the oil drips off the pan it ends up on the engine side of that silver stiffening plate that is beneath the oil pan. That explains why I never saw oil on my garage floor.

My question for anyone who may have knowledge about this sort of thing is, where is the oil coming from? Its not a lot of oil. It takes a few thousand miles or a few months to lose between 3/4 and a full quart. Its obviously a very slow leak. Could it be coming from the place where the oil sensor screws into the engine? I posted a picture that I took of the area in question. Anyone ever had a slow oil leak on their 4.4 like what I am describing?

I am just glad that my engine has not been eating a lot of oil all this time as I previously suspected!

Thanks in advance.


Attachment 17717
From your photo, if the oil is traveling down that black tube, that is the oil return tube. The smaller tube that branches off of it comes from the bottom of the oil separator. Perhaps the small connecting tube from the oil sep. has a leak?

Check #10 and #11 in this diagram:
RealOEM.com BMW E53 X5 4.4i Crankcase-Ventilation/oil separator
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Old 04-04-2010, 06:28 PM
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i have the same issue, however i dont think its the valve cover gaskets because I changed them. my vote is for the rear main seal, once the winter comes and the oil seperator freezes up theres only one way to go and that is out through the weakest spot.
2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD
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Old 04-04-2010, 09:36 PM
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leftside front timing cover gasket. had it happen on my e39 4.4, exact same oil drip location.
2006 4.8iS Black/Black with custom Audison Voce/Image Dynamics sound
Production Date - 10/05
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Old 04-05-2010, 01:20 AM
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Where is that exactly located? Is there a diagram? Thanks everyone, I really need to get this fixed.
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Old 12-28-2010, 07:27 PM
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Oils dripping from the left side front,when the engine is warned up, the x5 start up rough, spotting, like there is a injector problem. after warmed up runs OK..there was smoke coming out of the heater smell like oil,when i check the engine oil was dripping out left front below the valve cover... i think it might be the valve cover gasket...what do you think???
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Old 12-29-2010, 03:24 PM
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I'm in agreement with flatlander. I would check the little rubber hose that connects your oil separator to the small metal line that returns back to your oil pan. When I replaced my valley pan gasket, this hose was soft and leaking. I have a 2002 4.4 also and replaced all the hoses, it was definitly time. It's a bear to get to it and you may even need to remove your intake manifold to reach behind where the oil separator is located. Good luck.
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