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Old 09-11-2016, 01:51 AM   #1
loggywd
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Oil Consumption 1l/1000km? No external leak.

I have a very high oil consumption in my car. I lost about 1l per 1000 km.

I have changed a leaking valve cover, valve cover gasket, CCV, oil filter housing gasket. I can confirm these parts no longer leak any oil.

There is also no external leak observable from any part of the engine.
And there is no smoke coming out of the exhaust during idling, but unknown at higher speed.

The only theory I have now is that oil is consumed by combustion based on the fuel trim. Fuel trim is consistently negative. So ECU is always trying to compensate for rich mix, which is caused by oil contamination, but it is not enough to trigger any code so far.

Can anyone give any idea why this is happening and what I may do to fix it?
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Old 09-11-2016, 02:13 AM   #2
sprintman
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Quote:
Originally Posted by loggywd View Post
I have a very high oil consumption in my car. I lost about 1l per 1000 km.

I have changed a leaking valve cover, valve cover gasket, CCV, oil filter housing gasket. I can confirm these parts no longer leak any oil.

There is also no external leak observable from any part of the engine.
And there is no smoke coming out of the exhaust during idling, but unknown at higher speed.

The only theory I have now is that oil is consumed by combustion based on the fuel trim. Fuel trim is consistently negative. So ECU is always trying to compensate for rich mix, which is caused by oil contamination, but it is not enough to trigger any code so far.

Can anyone give any idea why this is happening and what I may do to fix it?
Using correct spec oil??
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Old 09-11-2016, 08:06 AM   #3
markusmarkus
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Oil Consumption 1l/1000km? No external leak.

Were the CCV parts aftermarket or from the dealer? Your oil consumption is a bit high. In the US the BMW NA standard is a quart every 1000 miles.

Last edited by markusmarkus; 09-11-2016 at 08:07 AM.
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Old 09-12-2016, 11:22 AM   #4
loggywd
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Were the CCV parts aftermarket or from the dealer? Your oil consumption is a bit high. In the US the BMW NA standard is a quart every 1000 miles.
To me 1qt/1000km is also too high anyway. I use castrol edge 0w40, which I think meets standard. CCV was from local part store so it could be the problem there. It was the cold climate version which I thought is supposed to be better than stock.
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Old 09-12-2016, 11:54 AM   #5
ybuybmw
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Were the CCV parts aftermarket or from the dealer? Your oil consumption is a bit high. In the US the BMW NA standard is a quart every 1000 miles.
This is normal? That's almost exactly the consumption that I'm getting, and I was considering replacing my CCV as the car isn't leaking. If it's typical then maybe I can save myself that hassle for now.
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Old 09-12-2016, 12:15 PM   #6
zheka130
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I thought the CCV can be checked with the oil cap vacuum test. If the cap is being sucked by the vacuum when you open it when the engine is running, that means that the CCV isnt working well, if the suction is small then its fine.

Not sure though if this test passes and other possibilities are potentially there?
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Old 09-12-2016, 12:35 PM   #7
CalVol
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Check "poolman's" 50-page thread... E46 has well-documented oil usage issue due to low-tension rings (scraper ring).... if these rings are carbonized and stuck, likely requires a rebuild....
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Old 09-12-2016, 01:03 PM   #8
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rebuild engine or add oil and enjoy. people need to stop complaining about oil consumption on old bmws. just a fact of life.
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Old 09-12-2016, 01:47 PM   #9
loggywd
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This was done and it behaved exactly as said. There is a weak vacuum from the filler cap.
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Old 09-12-2016, 01:59 PM   #10
loggywd
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By the way compression test results are excellent. I know it has nothing to do with oil control ring, but I have no idea why oil control ring becomes stuck in the groove while others don't.
I will try AutoRX cleaner and other methods before taking the head off.
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Old 09-12-2016, 02:03 PM   #11
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By the way compression test results are excellent. I know it has nothing to do with oil control ring, but I have no idea why oil control ring becomes stuck in the groove while others don't.
I will try AutoRX cleaner and other methods before taking the head off.
2 bottles Auto-Rx Plus and non ester oil (very important) run it 5000 miles/8000 kms.
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Old 09-12-2016, 02:06 PM   #12
loggywd
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2 bottles Auto-Rx Plus and non ester oil (very important) run it 5000 miles/8000 kms.
What is non-ester oil?
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Old 09-12-2016, 02:30 PM   #13
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What is non-ester oil?
Non-ester oil = non-synthetic = dino oil
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Old 09-12-2016, 11:37 PM   #14
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Non-ester oil = non-synthetic = dino oil
Close enough. A Group III syn will do but straight dino (mineral) oil better, and same oil for rinse mode.
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Old 09-13-2016, 12:08 AM   #15
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Non-ester oil = non-synthetic = dino oil
Group IV PAO oils are synthetic, but unlike the esters, the products are non-polar hydrocarbons. Nowadays they also synthesize oils from natural gas, but I've not seen the chemistry yet.
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Old 09-13-2016, 02:23 AM   #16
CalVol
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Nowadays they also synthesize oils from natural gas, but I've not seen the chemistry yet.
Pennzoil Ultralube is one synthsized from natural gas. It's also a high-detergent oil, using it now to try to keep the piston rings clean. It's about a Group 3.5 from what I gather. I've used Group IV Amsoil for years, will go back to that when I'm convinced the pistons/rings are cleaned as much as possible with the Ultralube, about to do my third oil change with it.

Last edited by CalVol; 09-13-2016 at 02:25 AM.
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Old 09-13-2016, 04:18 AM   #17
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You could also try a thicker oil, like 5W40, although I doubt there will be a big difference. To me, the M54 engines are famous with the high oil consumption and the only solution I am aware of is an engine rebuild.

^^ I know it's not the case for all M54s.
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