Bimmerpost
3
/
4 Series
BMW Garage BMW Meets Register Today's Posts
Technical Topics Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin Rear Diff fluid at 30,000 miles

Post Reply
 
Thread Tools Search this Thread
      09-18-2023, 08:08 PM   #1
Delighted_Jester
Private First Class
Delighted_Jester's Avatar
United_States
64
Rep
112
Posts

Drives: BMW M340i
Join Date: Feb 2021
Location: USA

iTrader: (0)

Rear Diff fluid at 30,000 miles

I changed my diff fluid last week in my 2020 M340i w/M Sport Differential. I used Hypoid Axle Oil G-4 P/N83222447362. Pictured is the old fluid versus the new G-4 axle oil. I also used the differential tool from FCP Euro B33000000.
Attached Images
 
Appreciate 2
      09-18-2023, 11:59 PM   #2
dhock_holiday
Lieutenant
256
Rep
421
Posts

Drives: M340i
Join Date: Jul 2022
Location: Texas, USA

iTrader: (0)

Pretty dark for 30K, I guess I’ll be doing mine earlier.
Appreciate 0
      09-19-2023, 05:52 AM   #3
Delighted_Jester
Private First Class
Delighted_Jester's Avatar
United_States
64
Rep
112
Posts

Drives: BMW M340i
Join Date: Feb 2021
Location: USA

iTrader: (0)

Quote:
Originally Posted by dhock_holiday View Post
Pretty dark for 30K, I guess I’ll be doing mine earlier.
I think BMW recommends changing it at 60k. Ill do it every 50 with the transmission from now on i think.
Appreciate 1
      09-19-2023, 08:17 AM   #4
weinerbarn
Unapologetic Tool Hoarder
weinerbarn's Avatar
785
Rep
1,033
Posts

Drives: 2020 X5 M Competition
Join Date: Nov 2020
Location: Missouri

iTrader: (0)

I wonder if a lot of that has to be the friction material from initial break-in. This was from my X5MC at the 1200 mile service. Did you see a lot of suspended metal in the fluid?
Attached Images
 
Appreciate 0
      09-19-2023, 01:43 PM   #5
Delighted_Jester
Private First Class
Delighted_Jester's Avatar
United_States
64
Rep
112
Posts

Drives: BMW M340i
Join Date: Feb 2021
Location: USA

iTrader: (0)

Quote:
Originally Posted by weinerbarn View Post
I wonder if a lot of that has to be the friction material from initial break-in.
Now that you posted that pic, i feel a little better. I dont really see anything suspended in my fluid. Your fluid looked worse than mine did but being that its only 1200 miles im certain BMW factory filled fluid IS NOT the specified G-4 fluid, rather something else that is "forever fluid".

How did yoy extract the fluid? I used that tool and a $40 oil pump from northern tool. Im sure your diff also lacks a drain plug?
Appreciate 0
      09-19-2023, 02:07 PM   #6
weinerbarn
Unapologetic Tool Hoarder
weinerbarn's Avatar
785
Rep
1,033
Posts

Drives: 2020 X5 M Competition
Join Date: Nov 2020
Location: Missouri

iTrader: (0)

Quote:
Originally Posted by Delighted_Jester View Post
Now that you posted that pic, i feel a little better. I dont really see anything suspended in my fluid. Your fluid looked worse than mine did but being that its only 1200 miles im certain BMW factory filled fluid IS NOT the specified G-4 fluid, rather something else that is "forever fluid".

How did yoy extract the fluid? I used that tool and a $40 oil pump from northern tool. Im sure your diff also lacks a drain plug?
Fortunately the rear diff on mine (F95) has separate drain and fill plugs. I used a "syringe" from Harbor Freight to refill. I think it's called a "Lubricant Suction Gun". I'm probably going to buy one of the ratchet pumps for doing the transfer case and transmission fill. I haven't the oppty to change the fluid yet in either the 540i or M340i yet.
Appreciate 1
      09-24-2023, 04:31 AM   #7
hayko_M340
Second Lieutenant
152
Rep
247
Posts

Drives: 2020 BMW M340I
Join Date: Jul 2016
Location: California

iTrader: (0)

Well that's not good to see, just passed 46K and diff is untouched and "sweating" per dealer. Took it in and they said it's normal per TSB. Gonna try taking it in again before warranty ends to hopefully get a new cover and some fresh fluid in there.
Appreciate 0
      09-24-2023, 06:02 PM   #8
Delighted_Jester
Private First Class
Delighted_Jester's Avatar
United_States
64
Rep
112
Posts

Drives: BMW M340i
Join Date: Feb 2021
Location: USA

iTrader: (0)

Quote:
Originally Posted by hayko_M340 View Post
Well that's not good to see, just passed 46K and diff is untouched and "sweating" per dealer. Took it in and they said it's normal per TSB. Gonna try taking it in again before warranty ends to hopefully get a new cover and some fresh fluid in there.
Sorry to hear about that. If you get a new cover, youll also get new fluid, so i hope they replace it for you! Leaks are never "normal" but some can be ignored. Thankfully my 2020 does not sweat any fluid.
Appreciate 0
      02-28-2024, 02:17 AM   #9
hayko_M340
Second Lieutenant
152
Rep
247
Posts

Drives: 2020 BMW M340I
Join Date: Jul 2016
Location: California

iTrader: (0)

Thought I'd update, got it changed out at 50K and I'm glad I did. Fluid came out looking like metallic nail polish. Measured 700ML that came out and ended up filling 900ML. Clunk/thump severely reduced especially when cold, obvious since it seeped out a good amount. Highly recommend if you plan on keeping long term and if driven hard.
Appreciate 1
      05-09-2024, 11:24 PM   #10
dhock_holiday
Lieutenant
256
Rep
421
Posts

Drives: M340i
Join Date: Jul 2022
Location: Texas, USA

iTrader: (0)

Quote:
Originally Posted by hayko_M340 View Post
Thought I'd update, got it changed out at 50K and I'm glad I did. Fluid came out looking like metallic nail polish. Measured 700ML that came out and ended up filling 900ML. Clunk/thump severely reduced especially when cold, obvious since it seeped out a good amount. Highly recommend if you plan on keeping long term and if driven hard.
Yup, 100% doing my diff fluid change at 30K on the dot. Anyone know how the dealer does it? Do they use a vacuum pump or something to get the fluid out? Or do they just do it like us, and take out the temp sensor and use a syringe
Appreciate 0
      07-09-2024, 10:23 PM   #11
Schantin
Private First Class
Schantin's Avatar
158
Rep
124
Posts

Drives: BMW 330i
Join Date: Aug 2022
Location: Texas

iTrader: (0)

Quote:
Originally Posted by Delighted_Jester View Post
I changed my diff fluid last week in my 2020 M340i w/M Sport Differential. I used Hypoid Axle Oil G-4 P/N83222447362. Pictured is the old fluid versus the new G-4 axle oil. I also used the differential tool from FCP Euro B33000000.
I changed my rear diff fluid on my 330i @49,800 miles yesterday. The before and after oil pics look exactly like your samples. I plan to do future changes every 50k miles.
Appreciate 1
      07-11-2024, 11:22 AM   #12
ukr
Private First Class
89
Rep
131
Posts

Drives: bmw
Join Date: May 2009
Location: USA

iTrader: (0)

On M diff you can extract fluid by removing the temperature sensor, no need for extraction tools.
Appreciate 3
      08-29-2024, 11:26 PM   #13
D0NVT
Private
12
Rep
56
Posts

Drives: 330d
Join Date: Feb 2023
Location: Moscow

iTrader: (0)

Yo guys,
What do you think of filling it with something like Redline oil 75w90 LSD instead of BMW G4?
Seems to be BMW G4 rear oil is 75w80 LSD…

Last edited by D0NVT; 09-04-2024 at 03:37 AM..
Appreciate 1
dabloo0.00
Post Reply

Bookmarks


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 06:38 PM.




g20
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, 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