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General E46 Forum
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Old 11-21-2013, 09:18 AM   #1
doms_330ci
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330ci burning oil

I have a 330ci that burns alot of oil almost a quart per 1000 miles what could this be? Could i need new compression and oil scraping rings because oil is passing through into the cylinder and burning? I also have some white smoke coming out of my exhaust? How can i fix this and is it harmful for the engine?
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Old 11-21-2013, 09:21 AM   #2
Solidjake
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Most likely the oil separator.
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Old 11-21-2013, 09:24 AM   #3
markusmarkus
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330ci burning oil

Pull the DISA valve and check the inside of the intake manifold. If it's coated with oil your ccv (aka oil separator) is shot. How many miles on the car?


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Old 11-21-2013, 09:24 AM   #4
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Burning oil is not necessarily harmful for the engine but running low on oil is. Fix any leaks, replace the ccv. if you still consume oil (99% chance you will) then just live with it or pony up and take a chance.
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Old 11-21-2013, 01:16 PM   #5
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Quote:
Originally Posted by doms_330ci View Post
I have a 330ci that burns alot of oil almost a quart per 1000 miles what could this be? Could i need new compression and oil scraping rings because oil is passing through into the cylinder and burning? I also have some white smoke coming out of my exhaust? How can i fix this and is it harmful for the engine?
Does the oil you use meet spec? 5W30 syn is NOT a valid response
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Old 11-21-2013, 01:42 PM   #6
inebriation
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Check the Oil Filter Housing Gasket and the CCV
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Old 11-21-2013, 02:39 PM   #7
doms_330ci
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Ok I will check it out thank you for the replies I will let you know what happen.
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Old 11-21-2013, 04:53 PM   #8
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CCV-valve seals/guides-oil rings.
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Old 11-21-2013, 05:27 PM   #9
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Im still having fun with this issue.

*Note any leaks to pin-point areas to check* (Oil filter housing, Valve Cover Gasket, Vanos Feed Line, etc)

Check the easy sh*t first - test your PCV/CCV by turning on car and with it running take off your oil fill cap (on top of engine cover) and if struggles to stay alive or bogs down a lot, then your PCV/CCV could be one of the culprits; most likely clogged.

Check around the Valve cover gasket and replace if needed.

Now as for internals of oil consumption; I was told two things: if you drive mostly city (stop, go, stop go) and are using most your oil then it could be the valve guide seals. If youre driving mostly highway miles and losing most your oil then it could be the piston rings. That is the trickiest one to figure out for me.

Oil consumption can be not soo good in the loooong run; but running out oil in your engine will eat it ALIVE! So keep up on it! In looong run, your o2 sensors and catalytic converter can suffer from damage of oil.

Goodluck with this; Im having fun with it still!
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Old 11-22-2013, 09:50 AM   #10
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330ci burning oil

I'm having a problem accepting the validity of the oil filler cap test. Why? I performed this on my 2001 330Ci (106k miles), and it passed. However, when I replaced the ccv (the car was using oil) the hose from the ccv to the dipstick was bone dry and the inside of the intake manifold looked like a Texas oil field! Obviously the ccv was kaput but the car passed the vacuum test with flying colors!!


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Old 11-22-2013, 09:56 AM   #11
inebriation
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Also check the oil dipstick o-ring at the base of your engine...that could be broken and leaking plus if your CCV is messed up/clogged, this could cause blockage in the oil dipstick tube itself.
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Old 11-22-2013, 12:02 PM   #12
xDLXSFx
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I'm having a problem accepting the validity of the oil filler cap test. Why? I performed this on my 2001 330Ci (106k miles), and it passed. However, when I replaced the ccv (the car was using oil) the hose from the ccv to the dipstick was bone dry and the inside of the intake manifold looked like a Texas oil field! Obviously the ccv was kaput but the car passed the vacuum test with flying colors!!


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This was explained to me by my mechanic that dealt with tons of issues regarding oil consumption, so that is first I heard; but I suppose if the drain line is clogged, that can cause build-up. Were you driving in colder months when this happened? Causing the infamous water/oil build-up in PCV? Gotta love figuring this stuff out lol.

Another trick he told me that he's done to 7 series that eat up oil is drilling 1/8" hole in oil filler cap to release any back-up pressure - he has mentioned fixing plenty of oil consumption problems this way, or dramatically diminished the problem.
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Old 11-23-2013, 10:38 AM   #13
markusmarkus
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330ci burning oil

The drain line wasn't blocked at all. The rubber hose (from the ccv valve to the dipstick tube) was completely dry!!!! I drive the car a few times a week, with one of those outings a 15-mile jog at highway speeds - to stretch his legs!!

I live in northern Virginia so the weather hasn't been cold (unless you're from Miami!).


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