Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E90/E91/E92/E93 (2006 - 2013)

E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 06-18-2017, 10:35 AM
msanchez msanchez is offline
Registered User
Location: Diamond Bar
 
Join Date: Jun 2017
Posts: 2
Mein Auto: 2009 BMW 328i Sedan
Rear Main Seal Leak

I took my car to a shop and my Dad's friend is the mechanic. He told me i have a rear main seal leak. It's leaking slowly, but i think it's time i get it fixed. About how much will it cost and anyone have any suggestions on where i should take it? Please && thank you in advance !

Sent from my SAMSUNG-SM-G925A using Bimmerfest mobile app
Reply With Quote
Advertisement
  #2  
Old 06-18-2017, 11:26 AM
Folgen Sie Mir's Avatar
Folgen Sie Mir Folgen Sie Mir is online now
Officially Welcomed to the 'Fest
Location: PAC NW
 
Join Date: Jan 2014
Posts: 600
Mein Auto: Fast
Did you not get a price @ the shop you took it to?

Sent from my SM-G930P using Bimmerfest mobile app
Reply With Quote
  #3  
Old 06-18-2017, 12:00 PM
msanchez msanchez is offline
Registered User
Location: Diamond Bar
 
Join Date: Jun 2017
Posts: 2
Mein Auto: 2009 BMW 328i Sedan
I did he told me right under $800 but my friend's dad is too busy now and he can't do it anymore

Sent from my SAMSUNG-SM-G925A using Bimmerfest mobile app
Reply With Quote
  #4  
Old 06-18-2017, 12:26 PM
gbalthrop gbalthrop is online now
Officially Welcomed to the 'Fest
Location: Fairfax County, Virginia
 
Join Date: Mar 2017
Posts: 172
Mein Auto: 2007 328xi
Quote:
Originally Posted by msanchez View Post
I took my car to a shop and my Dad's friend is the mechanic. He told me i have a rear main seal leak. It's leaking slowly, but i think it's time i get it fixed. About how much will it cost and anyone have any suggestions on where i should take it? Please && thank you in advance
No offense to your Dad's friend, but I would be VERY suspicious of that diagnosis by someone who is NOT familiar enough with your model vehicle to answer those questions for you, or be qualified to make a proposal to do the work himself.

Rear crank seal leaks WERE common until ~ 30 years ago, but unless your 2009 model has 200,000+ miles on it, or was abused in some fashion, I would CERTAINLY want to see the leak with my own eyes before accepting THAT as the cause of your "slow leak."

I would suggest removing the lower covers, cleaning the engine thoroughly top to bottom, and then examining it carefully every day or two to see where the leak originates. When you park after operating to full temperature = hot oil, put cardboard underneath to catch oil dropped, and then carefully mark the chassis position above the spots. Put the front wheels on ramps and carefully examine beneath, and then try to trace the leak upward and/or forward. Using a bright light at night or in dark garage is best way I know to see the trail of an oil leak (better than UV dye ;-)

The two most reported/confirmed oil leak sources on these vehicles seem to be the Oil Filter Housing Gasket and the Valve Cover Gasket. Leaks from either of those can cause problems with other things, such as the serpentine belt, plug/coil misfires, smoke from oil on the hot exhaust/cat, etc.

A slow leak from the rear crank seal is just a cosmetic nuisance, and unlikely to get worse in dramatic fashion (IF in fact that is the leak source ;-)

George
Reply With Quote
  #5  
Old 06-18-2017, 04:29 PM
smassey321 smassey321 is offline
Officially Welcomed to the 'Fest
Location: Ponte Vedra Beach, FL
 
Join Date: Feb 2007
Posts: 458
Mein Auto: 09 X5d - 06 325i
It is not possible to tell a oil pan gasket leak from a rear main seal leak. They both leak from the same place. 90% of the time it is the oil pan gasket. This assumes nothing from up top is leaking down to that area.
Reply With Quote
  #6  
Old 06-18-2017, 07:17 PM
alpinweiss alpinweiss is offline
Officially Welcomed to the 'Fest
Location: Nuevo MÚxico
 
Join Date: Sep 2009
Posts: 2,179
Mein Auto: E46, E83, E90 (all MT)
Yes, it is possible to have a leaking rear main seal. But this is not a common problem on cars with your engine. I would look at other, more common problem areas first.

__________________
Alpinwei▀
E46, E83, E90 (all with three pedals)
F25 (missing third pedal)
BMW CCA member
Reply With Quote
  #7  
Old 06-18-2017, 10:57 PM
acoste's Avatar
acoste acoste is online now
Officially Welcomed to the 'Fest
Location: California
 
Join Date: Nov 2011
Posts: 3,270
Mein Auto: 2010 550i MT
Sometime the excess vacuum in the crankcase (due to failed CCV system) can pull in the rear main seal. It gives a chirping sound and when you remove the oil cap it goes away.
__________________
2010 BMW 550i MT
2003 BMW 325i @195k and counting
1998 BMW 528i MT @ 231k //sold
1997 Saab 9000 //sold
Reply With Quote
  #8  
Old 06-19-2017, 05:45 AM
NoQuarter's Avatar
NoQuarter NoQuarter is offline
Officially Welcomed to the 'Fest
Location: Indiana
 
Join Date: May 2010
Posts: 1,453
Mein Auto: 2008 535xi
Quote:
Originally Posted by smassey321 View Post
It is not possible to tell a oil pan gasket leak from a rear main seal leak. They both leak from the same place. 90% of the time it is the oil pan gasket. This assumes nothing from up top is leaking down to that area.
This right here.

Oil pan leaks and runs backwards towards the transmission and drips from there.

Sent from my LG-H820 using Bimmerfest mobile app
__________________
Reply With Quote
Reply

See More Related BMW Stories


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E90/E91/E92/E93 (2006 - 2013)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 09:05 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms