E90Post
 


European Auto Source (EAS)
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Changed MT fluid to Redline D4, now can smell D4 when driving?



Reply
 
Thread Tools Search this Thread
      02-03-2019, 11:43 AM   #1
NumericalIntegration
New Member
0
Rep
10
Posts

Drives: 2006 325i
Join Date: May 2018
Location: SC

iTrader: (0)

Changed MT fluid to Redline D4, now can smell D4 when driving?

Hello all, as the title states, I changed my MT fluid to Redline D4 ATF since I've seen it recommended, and it's a bit thinner than MTL and a bit thicker than D6. Since then, when I hit it with WOT at med-high RPMs I can smell the D4 I just put in inside the car (06 325i, Gertrag GS6-17BG). I crawled under the car to check for leaks and checked the plugs. The fill and drain plugs have no leaks. The output shaft seal seems pretty dry. The selector shaft seal however has some fluid gathered near it (see attached picture). I thought I found my issue but when I got that fluid on my finger and smelled it it definitely didn't smell like ATF, it just smelled like some regular oil. The only thing I can think of is that it was either the original BMW fluid or the MTL I had in there before. So it's probably something I should replace but it doesn't seem to be where the D4 is coming from.

Today I was looking on RealOEM and I saw a ventilation valve on top of the transmission, what is this ventilation valve? Is it possible I overfilled the D4 and this valve is ventilating vapors from inside the overfilled transmission when under high load? Any input would be appreciated.
Attached Images
 
Appreciate 0
      02-03-2019, 01:29 PM   #2
Efthreeoh
Lieutenant General
United_States
5698
Rep
13,633
Posts

Drives: E90 & Z4 Coupe
Join Date: May 2012
Location: MARLAND

iTrader: (0)

That is the shift shaft, not the vent cap. The fluid can leak from the shaft seal, but it is very little if it does; you'd never smell it from inside the cabin. Are you sure you just didn't get the new trans oil on the upholstery and that is what you are smelling? It's not possible to overfill the transmission if the car is level when you refill it. When the fluid starts to dribble out of the fill hole the trans is correctly filled.
__________________
A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission.
Appreciate 0
      02-03-2019, 02:13 PM   #3
NumericalIntegration
New Member
0
Rep
10
Posts

Drives: 2006 325i
Join Date: May 2018
Location: SC

iTrader: (0)

Quote:
Originally Posted by Efthreeoh View Post
That is the shift shaft, not the vent cap. The fluid can leak from the shaft seal, but it is very little if it does; you'd never smell it from inside the cabin. Are you sure you just didn't get the new trans oil on the upholstery and that is what you are smelling? It's not possible to overfill the transmission if the car is level when you refill it. When the fluid starts to dribble out of the fill hole the trans is correctly filled.
I'm sure it isn't on any upholstery inside because I never smell it unless I'm accelerating quickly and even then it's not always. When I was doing the change I did make quite a mess putting the second bottle in so I guess it's possible I splashed some near the exhaust so it could be smelling when it gets hot?

I asked about overfilling because that's the only other explanation I can think of but I also am unfamiliar with how the vent works.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off



All times are GMT -5. The time now is 07:34 PM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST