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Old 06-07-2014, 10:34 AM   #1
jrat59
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Oil consumption

Hey guys...


So I have an 05 330ci zhp that's consuming some oil.

I did the vanos on it recently she runs like a champ but I'm thinking the consumption is from the oil separator or CCV whichever you would rather call it.

Thinking about making a catch can instead of replacing the CCV with another failing part ... Heard this is one of the most common problems with the M54

Wondering what other people have done and what vacuum is like in your motor.


Any info helps!
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Old 06-08-2014, 01:05 AM   #2
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Since you did your vanos I assume you also replaced the valve cover gasket right?

Another common spot is the oil filter housing gasket.

I did my CCV last summer. It's not too bad. I should get another 10 years out of it

I think my valve stem seals may be allowing a bit of oil past though... not too much however.
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Old 06-08-2014, 01:28 AM   #3
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Quote:
Originally Posted by jabela View Post

I did my CCV last summer. It's not too bad. I should get another 10 years out of it
3-4 years in most cases, even with the updated "cold weather" parts...

Pretty much no need for it at all, when i had my AA SC on the 330 it was completely eliminated, no issues at all...
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Old 06-08-2014, 11:28 AM   #4
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Well the first one lasted ten years and I've added an oil pan heater for the winter which will help eliminate one of the failure modes. Anyhow I'd still be okay with five years.
Of course a super charger would be a great way to eliminate it :-)
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Old 06-08-2014, 12:12 PM   #5
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I agree with jabela, the seals can allow a loss, not uncommon, some e46's see a loss of 1+ liters within a short amount of time (weeks vs months), annoying but not truly worth a fix on a higher mileage engine.

A loss due to a leak is also not uncommon, in fact as mentioned the ccv, vcg and oil filter housing gasket are things I see nearly daily. However in saying that if you are losing that much oil due to any of these leaks you have a MASSIVE leak.

As for the catch can...lol
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Old 06-09-2014, 07:34 AM   #6
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OP, is the engine leaking oil, or burning it?

To further the CCV conspiracy theories: after eliminating all my oil leaks and still having a fair amount of consumption, I replaced the CCV with the cold weather version. It didn't make much of a difference. Then I installed a vacuum line from the manifold to the CCV as per these posts:
http://forums.bimmerforums.com/forum...2#post26772712
http://forums.bimmerforums.com/forum...3#post26776943

and over the next few weeks/months, my oil consumption slowly dropped to much more manageable levels. (~1/2 qt every 4-6 weeks or 2000-3000 km)
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Old 06-09-2014, 07:41 AM   #7
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I suspect he is leaking since he mentioned a catch can.
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Old 06-09-2014, 09:43 AM   #8
jabela
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Originally Posted by Blackedout95 View Post
I suspect he is leaking since he mentioned a catch can.
Consuming oil is much more common on E46 than leaking.
They really only leak from the valve cover gasket or oil filter housing. Usually just a small amount. A completely shot CCV can leak too, but it's less common.

I looked up catch cans, but you're still consuming oil, just in the catch can. Plus then you have to remember to empty it regularly.

I'm going to look into the link cheapthrills posted. I don't have any major consumption. E46 have always been known to consume oil from brand new. I think 1L per 10k KM is typical.
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Old 06-09-2014, 10:39 AM   #9
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Even less than 10k is acceptable as per bmw. I drive a 12 year old XI and do not see any consumption of oil until about 8-9k, some see a liter within 2k, seals leak, it can happen and does but not extremely common really. I service about 150 e46's annually and know of just a few of our customers with the issue.

If your ccv is blowin or cracked it can lead to fuel trim codes and engine light. It will also be drawing air, the real solution is to replace it, period.
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Old 06-09-2014, 10:57 AM   #10
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Originally Posted by Blackedout95 View Post
Even less than 10k is acceptable as per bmw. I drive a 12 year old XI and do not see any consumption of oil until about 8-9k, some see a liter within 2k, seals leak, it can happen and does but not extremely common really. I service about 150 e46's annually and know of just a few of our customers with the issue.

If your ccv is blowin or cracked it can lead to fuel trim codes and engine light. It will also be drawing air, the real solution is to replace it, period.
Yep, for sure. Normal consumption is probably due to thin oil vaporizing easily and the sub-par CCV system that is not good at separating crank case gases from oil mist, causing that oil mist to be burned up instead of returning to the crank.
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Old 06-09-2014, 10:59 AM   #11
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One other thing we see on occasion is a complete oil bomb due to someone putting off their ccv replacement and going from hot/cold summer/winter causing cracking and eventually an oil bomb when blowing wide open, like a heart if you will. An absolute mess to clean but it happens on occasion not all the time.
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Old 06-10-2014, 11:46 AM   #12
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15 years on my original "hot climate" CCV here. Not a single issue, and I winter drive the 325i.

The "cold weather" version literally refers to a foam insulation added over the hoses. It does jack all.

Check your cylinder compression. 3 litre M54 engines are notorious for oil consumption.
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Old 06-16-2014, 10:22 AM   #13
jrat59
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sorry for the delayed response guys... been super busy...

its not leaking, its consumption... I heard that replacing the ccv with a catch can does wonders and it also makes crazy vacuum pressure.

This car will not be winter driven anymore ( it was before I bought it ) so just debating weather or not to do a catch can or replace the CCV

When I have the car parked for the winter, I plan to strip the motor down and probably do rings, a new metal head gasket and forced induction.

Any more input from everyone would be great.
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Old 06-17-2014, 01:30 PM   #14
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Oil consumption is normal. My retired 2001 e46 drank 1L every 4K for 150K after that it started to consume 1L every 2K. It never had a problem passing emissions.

My wife's 04 330ci drinks about 1L every 8K and has been doing that for day one and is now at 160K.

Even my 2007 X3 drinks 1K every 10K.

It is just what BMW engines do. I refuse to believe that no BMW i6 is perfect.

Stop worrying about it and go drive/enjoy it.

Life is too short to worry about oil consumption.

You can try a little ticker oil if its really bothering you that much.
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Old 06-18-2014, 05:21 PM   #15
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My oil consumption is to be blamed on my failing CCV system, i read that with it being clogged up either open or closed it can actually draw up oil from the crankcase via the vacuum hoses that run back into the intake manifold. My oil issue got better with more frequent oil changes and better oil.
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