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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Losing 1 qt engine oil every 300 miles..



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      05-17-2015, 10:23 AM   #1
rayleiwu
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Angry Losing 1 qt engine oil every 300 miles..

2007 335i with N54 engine. 107,000 miles.
Already replaced items: T stat, water pump, new valve cover w/ gasket, oil filter housing gasket

No leaks on the plastic cover under the engine
No blue/black smoke
No burning oil smell after the VC and FHG were replaced

What else should I look into?
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      05-17-2015, 11:19 AM   #2
Greyfox
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1qt every 300 miles? Honestly, you would find a puddle under your car when ever you parked it if it's not coming out the tail pipe.

I had an Audi A4 2.0T that at it's worse was burning 1qt every 2000 miles but it was going out the tail pipe.... and you could tell from the black on the pipes and residue on the trunk.
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      05-17-2015, 11:23 AM   #3
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Quote:
Originally Posted by Greyfox View Post
1qt every 300 miles? Honestly, you would find a puddle under your car when ever you parked it if it's not coming out the tail pipe.

I had an Audi A4 2.0T that at it's worse was burning 1qt every 2000 miles but it was going out the tail pipe.... and you could tell from the black on the pipes and residue on the trunk.
I have the black on the exhaust and rear bumper and trunk but I think thats mostly due to running slightly rich because of the tune.

I think the turbo seals should be checked next if possible since it sounds like you fixed most of the common issues.
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      05-17-2015, 11:59 AM   #4
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A quart every 300 miles is a pretty bad leak. If you can't figure it out, I'd be taking it to an Indy ASAP.
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      05-17-2015, 02:19 PM   #5
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Remove your downpipes to see if oil is dripping in there.... If not I would do a compression/leak down test to see if piston rings or valve seals are bad...
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      05-17-2015, 04:17 PM   #6
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Stupid question: What makes you think you have to add a quart? I would suspect the sensor. Your engine might be drowning in oil meanwhile. Drain the oil and see how much comes out.
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      05-17-2015, 06:54 PM   #7
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Quote:
Originally Posted by whiteblue View Post
Stupid question: What makes you think you have to add a quart? I would suspect the sensor. Your engine might be drowning in oil meanwhile. Drain the oil and see how much comes out.
This is worth a try. The oil HAS to be going somewhere, and if there's no evidence of burning, something weird. If you were burning a quart every 300 you would see it in the exhaust.
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      05-18-2015, 01:32 AM   #8
rayleiwu
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Quote:
Originally Posted by ColoCoug View Post
This is worth a try. The oil HAS to be going somewhere, and if there's no evidence of burning, something weird. If you were burning a quart every 300 you would see it in the exhaust.
Thank you guys for quick responses! I'll drain the oil as well as replacing the oil level sensor to see if that fixes the problem, before I start looking into the turbo..
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      05-18-2015, 01:37 AM   #9
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Quote:
Originally Posted by rayleiwu View Post
Thank you guys for quick responses! I'll drain the oil as well as replacing the oil level sensor to see if that fixes the problem, before I start looking into the turbo..
Maybe your oil sensor is on it's way out.
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      05-18-2015, 01:59 AM   #10
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I would suspect the sensor. Your engine might be drowning in oil meanwhile.
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      05-18-2015, 04:59 AM   #11
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If you really are losing oil, try replacing your PCV
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      05-18-2015, 06:27 AM   #12
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You've dropped the underbelly pan and inspected it? Also inspected your oil pan gasket?
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      05-18-2015, 09:44 AM   #13
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Question to OP, do you regularly get under carriage wash option when you are getting your car washed? This maybe regularly cleaning any slow oil leak accumulation on the belly pan before it becomes large enough to start dripping to the ground.
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      05-18-2015, 01:55 PM   #14
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Had this problem on an M6 but there was a visible puddle after being parked when warm. Problem turned out to be stones from the road that had punctured something at the front.
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      05-20-2015, 01:28 AM   #15
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Quote:
Originally Posted by NGEE View Post
You've dropped the underbelly pan and inspected it? Also inspected your oil pan gasket?
Belly pan has no fresh oil. Oil pan gasket is not leaking
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      05-20-2015, 01:30 AM   #16
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Quote:
Originally Posted by PhaseP View Post
Question to OP, do you regularly get under carriage wash option when you are getting your car washed? This maybe regularly cleaning any slow oil leak accumulation on the belly pan before it becomes large enough to start dripping to the ground.
Don't really wash car a lot. Maybe once in six months..
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      05-20-2015, 01:38 AM   #17
rayleiwu
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Just bought a Nissan LEAF over the weekend to replace the 335 as a commute ride so I can jack up the 335 and put it on "repair mode". Will update you guys what I might find out soon..
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      05-21-2015, 12:00 AM   #18
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i been adding oil to the car to . fairly quickly about 800-1000 miles. I think my sensor is out as well, have you checked your rear main seal?
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      06-28-2015, 02:58 AM   #19
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oil consumption issue fixed. Was the check valve inside Blow-By Vent Hose

Hi guys - I just want to report back what I found which has fixed the oil consumption problem! Turned out it was the check valve inside the hose that between head cover and suction line. The valve was stuck and was not closing during non-turbo mode. It was exactly the issue the Note described on the page 15 in attached pdf.

This is how to inspect the valve. Take the hose off, flip the hose up side down a few times, you should hear and see the valve (a metal flipper inside the hose) open and close. Otherwise you need a new one.. Even for the brand new hose, which was my case I bought at local BMW dealer, you would want to check it out before you put it on..
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File Type: pdf 2007 ENGINE MECHANICAL.pdf (528.2 KB, 56 views)
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      06-28-2015, 07:00 AM   #20
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Thanks for taking the time to return and post your solution. Glad you got it figured out.
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      06-28-2015, 11:28 AM   #21
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Quote:
Originally Posted by drewnel22 View Post
I have the black on the exhaust and rear bumper and trunk but I think thats mostly due to running slightly rich because of the tune. .
That evaluation of soot on the rear surfaces of the car was true in the days of CARBURETED engines, but with fuel injection and electronic emissions control and precise mixture adjustment by engine management units, it is seldom true to get a 'fuel rich exhaust' these days...normally now with vacuum leaks we might see 'lean mixture' coloring, but seldom 'rich mixture' coloring of exhaust surfaces.
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