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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-10-2010, 10:44 AM
Togatown22 Togatown22 is offline
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2001 325i high oil consupmtion question:

Hey all,
Long time lurker here, this is my first topic I believe.
My daily driver is a 2001 325i with 135k miles on it. I'm the second owner, I've owned it since 50k miles, purcased from local BMW dealership 4 yrs ago.
I have been changing the oil around 7500 miles regularly, as well having all regular maintenence and repairs done; car has been very well cared for.

Never noticed significant oil consumption until about 2 months ago. Warning light has been coming on almost once a week, and it always seems I'm about 1/2 quart low...of course I top up, and a week or 2 later the warning light again.
It's a manual, my mileage hasn't changed, I still get 30mpg. I commute on a county road (drive 55-60mph) 350 miles a week, it's a lot of miles but very easy driving.
I'm adding about 1/2 qt of oil, every 10-14 days.

Is this abnormal for a high mileage Bimmer given the miles I'm driving? I am not noticing (and have checked for) leakage from the drain pan, or oil burn from the tailpipe.

Thanks
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  #2  
Old 03-10-2010, 10:58 AM
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kunal_D kunal_D is offline
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There are few very common sources for leaks. The Valve Cover Gasket, Oil Filter Housing gasket and the CVV. At that mileage those should have all been changed out. With the amount of oil that you seem to be losing and you're location the CVV seems like a very probable cause.
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  #3  
Old 03-10-2010, 11:04 AM
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Quote:
Originally Posted by kunal_D View Post
There are few very common sources for leaks. The Valve Cover Gasket, Oil Filter Housing gasket and the CVV. At that mileage those should have all been changed out. With the amount of oil that you seem to be losing and you're location the CVV seems like a very probable cause.
All true....and there`s plenty of info on all these things archived here....just use the SEARCH function....
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  #4  
Old 03-10-2010, 11:09 AM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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Judging by the symptoms, I would guess your CVV (Crankcase Ventilation Valve), or "oil separator" as it's also known, has failed. It's sucking oil from the crankcase into the intake. Check your spark plugs. If any of them seem fouled up with oil, then that's what it is. Replace the CVV and all associated plumbing and you'll be good. And the reason you are not seeing smoke come out from the tail pipe is probably because oil is being burned off in the catalytic converters. You probably should do this ASAP before your catalytic converters are killed too.
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  #5  
Old 03-10-2010, 11:39 AM
Togatown22 Togatown22 is offline
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Thanks for the quick replies: i'll get in there this weekend or sooner and report back.
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  #6  
Old 03-12-2010, 02:43 PM
thefull thefull is offline
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Originally Posted by Togatown22 View Post
Thanks for the quick replies: i'll get in there this weekend or sooner and report back.
How did you get on? I have exactly the same symptoms with my 320i E46 Tourer
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  #7  
Old 03-12-2010, 05:39 PM
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Originally Posted by thefull View Post
How did you get on? I have exactly the same symptoms with my 320i E46 Tourer
1. Read Post #3

2. Lather

3. Rinse

4. Repeat
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Old 03-13-2010, 01:11 PM
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SJBimmer SJBimmer is offline
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Quote:
Originally Posted by thefull View Post
How did you get on? I have exactly the same symptoms with my 320i E46 Tourer
Welcome! Typically when you don't see an answer, it means that the problem has been solved. Would be nice if op posted back, but usually does not happen. Sounds like you might need to change your CCV valve as well. Good luck!
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  #9  
Old 03-13-2010, 03:40 PM
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Originally Posted by SJBimmer View Post
Welcome! Typically when you don't see an answer, it means that the problem has been solved. Would be nice if op posted back, but usually does not happen. Sounds like you might need to change your CCV valve as well. Good luck!
Also, most people don`t run right out and get the repair done within 48 hours of their initial post....(unless it`s an emergency situation)
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  #10  
Old 03-13-2010, 04:44 PM
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SJBimmer SJBimmer is offline
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Originally Posted by Fast Bob View Post
Also, most people don`t run right out and get the repair done within 48 hours of their initial post....(unless it`s an emergency situation)
Oh come on Bob, you know you would have that puppy repaired in 24 hrs! LOL If my cat converters were at risk, I would too.
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