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Old 11-12-2013, 11:58 AM   #1
adamdp
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Burning oil as fast as gas!!

Ok, so maybe not quite as fast but getting too close. My 2002 325xi is losing oil at a ludicrously high rate: 140 miles/qt in mixed driving, about 350 miles/qt highway. Even though it's losing oil, there are no leaks that I can find, no burning oil smell, no discoloration of exhaust, and the engine is running fine. Every once in a while there is a smell of rotten eggs which I believe is related to the catalytic converter. My question is, is my car really just burning that much oil and, if so, how long can it go before the engine dies? The car has 193,000 miles, no mods of any sort.
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Old 11-12-2013, 12:08 PM   #2
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quick question, what oil are you using?
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Old 11-12-2013, 12:09 PM   #3
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How long have you owned this car? What is the recent oil burning history? Did it start this all of a sudden?
Checked the plugs for condition?
Smoke out of the exhaust? Done the test for bad oil rings?
Coolant is oil free?

Last edited by Stinger9; 11-12-2013 at 12:10 PM.
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Old 11-12-2013, 12:22 PM   #4
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Got to start with the basics, engine temperature, you cannot use the dash gauge, you have to use either the Hidden OBC Menu, 4th link below in my signature or spend $30 or less if you have a smart phone or Windows laptop for a decent OBDII scan tool. See this link - http://forum.e46fanatics.com/showthread.php?t=967204

Next, as requested, what brand and weight engine oil are you using AND when/how long/how many miles ago was the oil changed??

Then are you 100% sure there are no oil leaks? You would be surprised the lower engine cover will hold a LOT of oil. Only way to confirm is get under the car and remove the engine cover. Oil Filter Housing Gasket is a very common leak point.

Then has the CCV system ever been replaced and has the dipstick ever been removed and cleaned?
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Old 11-12-2013, 01:20 PM   #5
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Check for a plugged up oil return in the dipstick tube. Causes massive amounts of oil consumption.
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Old 11-13-2013, 08:36 AM   #6
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Quote:
Originally Posted by Stinger9 View Post
How long have you owned this car? What is the recent oil burning history? Did it start this all of a sudden?
Checked the plugs for condition?
Smoke out of the exhaust? Done the test for bad oil rings?
Coolant is oil free?
I've had it for almost 4 years. I'm the second owner but I bought it off my parents who took good care, never missed a service or oil change. The plugs were replaced about 10k ago. Absolutely no smoke out of the exhaust. I'll have to get back to you on the coolant. There was a previous oil leak in the engine, i don't remember exactly where (can find out when I look back at my records) that had visible oil dripping onto the driveway.

After that leak was fixed, it was burning a little bit but not nearly as much, maybe a quart every 2k? Then over the last 2-3 months it went to a quart per tank, now quart per 150 miles.

Quote:
Originally Posted by jfoj View Post
Got to start with the basics, engine temperature, you cannot use the dash gauge, you have to use either the Hidden OBC Menu, 4th link below in my signature or spend $30 or less if you have a smart phone or Windows laptop for a decent OBDII scan tool. See this link - http://forum.e46fanatics.com/showthread.php?t=967204

Next, as requested, what brand and weight engine oil are you using AND when/how long/how many miles ago was the oil changed??

Then are you 100% sure there are no oil leaks? You would be surprised the lower engine cover will hold a LOT of oil. Only way to confirm is get under the car and remove the engine cover. Oil Filter Housing Gasket is a very common leak point.

Then has the CCV system ever been replaced and has the dipstick ever been removed and cleaned?
Thanks, i'll look into the OBC. Right now it's on Moile 1 5w-30, oil last changed about 2k ago. IIRC, the oil filter housing gasket was actually replaced previously for another leak (this stupid car has had a lot of oil issues the last 1.5 years) but I'll double check the service records tonight.

The CCV system has not been replaced. What would just cleaning off the dipstick do? It has never looked unusually dirty or covered in gunk when I've checked the oil level.
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Old 11-13-2013, 08:37 AM   #7
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Replace the CCV, it's that.
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Old 11-13-2013, 08:38 AM   #8
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The DIY I followed

http://www.bimmerfest.com/forums/sho...t=starless+ccv
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Old 11-13-2013, 08:39 AM   #9
adamdp
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Originally Posted by bmwbob89 View Post
Check for a plugged up oil return in the dipstick tube. Causes massive amounts of oil consumption.
How would I check for that? Just pulling the dipstick and looking for gunk?


Also, thanks everyone for the quick help!
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Old 11-13-2013, 08:42 AM   #10
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oh boy does that look like fun
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Old 11-13-2013, 08:49 AM   #11
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Just out of curiosity, sometimes when the car idles it's revving up and down too much, it actually stalled on me once. Any chance the CCV could be a related issue?
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Old 11-13-2013, 08:50 AM   #12
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CCV, stat! It is possible to hydrolock the engine if it ingests enough oil due to catastrophic CCV failure.
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Old 11-13-2013, 08:55 AM   #13
Solidjake
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oh boy does that look like fun
Arguably one of the hardest DIY's on the car due to the sheer lack of space to work with. It's not THAT bad but if you're new to fixing cars this will break you
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Old 11-13-2013, 08:55 AM   #14
Solidjake
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Just out of curiosity, sometimes when the car idles it's revving up and down too much, it actually stalled on me once. Any chance the CCV could be a related issue?
Clean the throttle body and ICV as you're replacing the CCV and I would just replace both upper and lower intake boots.
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Old 11-13-2013, 09:00 AM   #15
adamdp
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Arguably one of the hardest DIY's on the car due to the sheer lack of space to work with. It's not THAT bad but if you're new to fixing cars this will break you
Nice to see you take pleasure in my demise
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Old 11-13-2013, 09:02 AM   #16
adamdp
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Originally Posted by teamdfl View Post
CCV, stat! It is possible to hydrolock the engine if it ingests enough oil due to catastrophic CCV failure.

Any ideas on cost to have a shop do this? Any chance I can keep it under $500?
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Old 11-13-2013, 09:39 AM   #17
markusmarkus
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Burning oil as fast as gas!!

Mobil 1 5W-30 ist verboten!!! It does not have the "BMW LL-01" imprimatur. Only Mobil 1 0W-40 meets the LL-01 spec!!


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Old 11-13-2013, 09:46 AM   #18
adamdp
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Originally Posted by markusmarkus View Post
Mobil 1 5W-30 ist verboten!!! It does not have the "BMW LL-01" imprimatur. Only Mobil 1 0W-40 meets the LL-01 spec!!


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AHHHH! good to know! but would that cause the problem? far as I know it's been on mobil 1 5w-30 for almost it's entire life.

Last edited by adamdp; 11-13-2013 at 09:46 AM.
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Old 11-13-2013, 09:49 AM   #19
adamdp
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Replace the CCV, it's that.
From everything I've read on the forums and on youtube vids, it seems more and more likely that its the CCV. If i brought it to my mechanic, would a crankcase pressure test give me a definitive diagnosis?
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Old 11-13-2013, 09:54 AM   #20
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The parts for CCV are around $150. Labor would probably be 4 hours book time. A good mechanic could probably do it in an hour-hour and a half...if he doesn't need to remove the intake for the cold weather kit (which you don't need).

You can do this diy...it seems a lot tougher from the reading than it is. Only issue I had was connecting the vent hose to valve and getting the left screw into the ccv without it dropping...coz I didn't have a magnetic bit. I used dumdum (aka butly tape, 3M window weld roll) on my bit to hold the screw on.

It's your CCV...undoubtedly.
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