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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > 2010 335i n55 oil leak



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      07-28-2019, 07:34 AM   #1
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2010 335i n55 oil leak

Hi guys, I've had a burning oil smell for a little while, got told it was the valve cover gasket. I've booked it in for this week to get done, however I went to start the car 3 days ago and the engine oil level has gone all the way to the bottom and telling me to fill up oil. I've looked in the engine bay and there is a puddle of oil in the front of the engine bay. I want to fill it up with some oil and drive it to the garage which is about 10 minutes from me, however I'm scared it will not hold the oil and will just come out, I don't want to ruin the engine. Any advice?
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      07-28-2019, 08:36 AM   #2
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Where on the front of the engine is it? Can you take a picture and post it?
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      07-28-2019, 08:36 AM   #3
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If it is in front of the engine bay, it might be the oil filter housing gasket that is leaking. If you can see oil on the belt and the charge pipe, it is pretty clear the OFHG is bad. Don't worry, very common problems on these cars.... By the way I believe 2010 is still the N54. Are you sure you got the N55?
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      07-29-2019, 08:04 AM   #4
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Quote:
Originally Posted by tonyttot View Post
By the way I believe 2010 is still the N54. Are you sure you got the N55?
He's not in the U.S. and I believe other places did get some 2010 N55s
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      07-29-2019, 09:42 AM   #5
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It's literally right at the front where the belts are. It seems all the oil has leaked out. Yeah 100% N55
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      07-29-2019, 10:30 AM   #6
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It's hard to guess how much oil you are talking about. If it's a few drops then it's probably a slow leak from the OFHG. If it literally is all the oil your front main seal probably popped out (not sure how that could happen just sitting), or your oil pan is cracked in the front.
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      07-29-2019, 10:43 AM   #7
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Quote:
Originally Posted by weehe126 View Post
It's hard to guess how much oil you are talking about. If it's a few drops then it's probably a slow leak from the OFHG. If it literally is all the oil your front main seal probably popped out (not sure how that could happen just sitting), or your oil pan is cracked in the front.
There is a puddle of oil on the undertray
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      07-29-2019, 10:52 AM   #8
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Pictures will help alot for us to assist
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      07-29-2019, 11:14 AM   #9
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Apologies for the bad photos it's hard to take a picture there are so many components in the way, the red arrow indicates where the puddle of oil is
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      07-29-2019, 11:27 AM   #10
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Oil filter/cooler housing gasket. It's not a fast leak you just didn't notice it for a while.
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      07-29-2019, 11:29 AM   #11
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Quote:
Originally Posted by weehe126 View Post
Oil filter/cooler housing gasket. It's not a fast leak you just didn't notice it for a while.
+1 , Easy DIY job. But these are things that should be monitored frequently
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      07-29-2019, 11:29 AM   #12
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Quote:
Originally Posted by weehe126 View Post
Oil filter/cooler housing gasket. It's not a fast leak you just didn't notice it for a while.
And that could cause a puddle of oil on the undertray?
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      07-29-2019, 12:51 PM   #13
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Originally Posted by Shak_il View Post
And that could cause a puddle of oil on the undertray?
Yes, again we have no idea how large this puddle is. The under tray will hold oil from a slow leak so over time it could look like a large leaked all at once if you don't regularly look at it.
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      08-07-2019, 03:00 PM   #14
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charge pipe

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Originally Posted by Shak_il View Post
Apologies for the bad photos it's hard to take a picture there are so many components in the way, the red arrow indicates where the puddle of oil is
Shak_il, I have a 1st gen Cobb charge pipe sitting in the box. Ready to ship if you are interested. $80 plus shipping?
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      08-10-2019, 09:34 AM   #15
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Quote:
Originally Posted by Shak_il View Post
And that could cause a puddle of oil on the undertray?
Did you throw a serpentine belt recently? Front main seal might be compromised?
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      08-10-2019, 09:35 AM   #16
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Got it sorted, apparently was valve cover gasket and camshaft sensor seal
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      08-10-2019, 04:26 PM   #17
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Replace that charge pipe. 80 shipped sounds like s good deal
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      08-10-2019, 04:49 PM   #18
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Quote:
Originally Posted by Ozzie335i View Post
Replace that charge pipe. 80 shipped sounds like s good deal
I would but I'm in the uk, so probably be beneficial to me to get one from here
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