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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Bluish White Smoke from Exhuast



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      04-16-2012, 09:57 PM   #1
delrosa81
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Bluish White Smoke from Exhuast

Anyone have any experience with the below problem?

My car is 2007 BMW E90 320i with the N46B20 engine.

My car, now consumes engine oil. When engine is switched off and left to rest for say an hour, after firing up, no issue. But if I try revving the engine hard in stationary position, I will see a huge cloud of bluish white smoke. No smoke at all during idle. Only when revved hard.

After driving for at least 15mins above, when I come to a stop, I try revving the car hard again, no bluish white smoke.

I have changed the oil seperator located under the intake manifold area. Are there any other pcv or hoses that might cause the engine oil consumption issue? Im also thinking my oil seperator might have been incorrectly installed.

Recently went to a workshop but they didnt bother to check but just straight said, Top Overhaul, common problem. 320i are all like that. They have done so many over the years.

I strongly do not believe a very well maintained 4yrs plus car with just 126,000km or 76,000miles of mileage would require an overhaul of any sorts. I have been scouring the net these few days to find out what is the reason but to no avail. Neither do I think valve seals are the culprit. Bcos there is no smoke upon startup from exhuast from cold.

There will only be smoke if the engine has run for awhile, left to rest for an hour or less, then there is the smoke if I rev hard.

Hope to get clues or ideas whats to be done.

Could the engine oil heat exchanger near the engine oil filter be the culprit if its clogged up or whatsoever?

Thanks!
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      04-17-2012, 07:37 AM   #2
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Many people will say rings, but I think the issues is in your head - possible issue with valves/seals or oil collecting somewhere in the head.

But I haven't worked on BMW engines, only Honda/Acura 4-Cyl. So I may be way off.
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      04-17-2012, 08:46 AM   #3
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Quote:
Originally Posted by mike5809 View Post
Many people will say rings, but I think the issues is in your head - possible issue with valves/seals or oil collecting somewhere in the head.

But I haven't worked on BMW engines, only Honda/Acura 4-Cyl. So I may be way off.
Thanks alot Mike for your advise
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      05-03-2013, 09:13 AM   #4
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Bluish White Smoke from exhaust

Hi,

Sorry to bother you!

I know your issue in regards to the blue/white smoke was a while ago but I have the same issue???

I haven't changed the Oil Seperator but I have read a lot about the valve seals

Did you resolve this, and if so what was the answer?

Cheers
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      05-03-2013, 10:54 AM   #5
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Does the smoke smell sweet? Sounds like your head gasket could be blown.
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      05-03-2013, 03:50 PM   #6
e90pilot
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I'm gonna say rings. If it was the guides or seals you would see smoke off throttle. Get a compression and leak down check.
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      05-03-2013, 08:04 PM   #7
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Quote:
Originally Posted by earld2005 View Post
Hi,

Sorry to bother you!

I know your issue in regards to the blue/white smoke was a while ago but I have the same issue???

I haven't changed the Oil Seperator but I have read a lot about the valve seals

Did you resolve this, and if so what was the answer?

Cheers

Hi, I resolved this finally by replacing my valve seals.
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