The general idea of changing rear differential fluid is to: 1. Jack up the vehicle, ensure it is leveled 2. Remove Fill Plug first 3. Remove Drain Plug after or 3. Siphon the old fluid out from the Fill Plug via a hook-shaped adapter, or a flexible hose 4. Pump the new fluid until it overflows from the fill hole 5. Wait for a couple of minutes until the overflow calms down and becomes dripping 6. Install a new Fill Plug 7. Lower the vehicle to the ground, start the vehicle to ensure there is no fault code 8. Go around the block, double-check to ensure there is no leak from both the Fill Plug and the Drain Plug -------------------- Tools Required (BMW M340i RWD & AWD & Supra MK5 A90/A91 & 40i with Limited Slip Rear Differential): - Jack & Jack Stands (or Wood Blocks) - Wheel Chocks - 14mm Hex Socket (Fill Plug) - 17mm Deep Socket (Temp Sensor) - Torque Wrench, that can do 14 Nm & 60 Nm respectively - Any type of fluid transfer pump - Hook-Shaped Hose Adapter or Flexible Hose - Disposable Gloves -------------------- Torque Spec: - Fill Plug: 60 Nm - Temperature Sensor: 14 Nm (Supra manual asks for 13.5 Nm) -------------------- Your support means the world to me. If you like the video, please give it a thumbs-up, share it with your friends who need this, and subscribe to my channel! By no means am I a professional mechanic, I am also trying to learn as I go, and to learn from my mistakes. If you do have any input or question, please feel free to drop them in the comments. I will try to address them as best as I can.
I really appreciate your kind words! Yes, I do plan on doing that in the soon future, along with transmission fluid! I already have the fluid sitting in my garage, but life got in the way lol. I’ll try to get them done and edit the videos ASAP! 😉
hi! great video! thanks for sharing the knowledge. question: is it really necessary to buy 3 botlles of the fluid? how much did you actually end up using? I've read some people were able to use 700-900ml of the new fluid only...
Thank you for the kind words, appreciate you too! I’m almost willing to bet, those people siphoned the old fluid from the fill plug, not knowing the temp sensor can be taken out and act as a drain. As far as the volume of fluid goes, I don’t think it’s necessary to get 3 bottles, but I’d recommend it.
To be honest, no noticeable difference before and after. But IMO that’s a good thing , it simply means the rear differential was not having any problem before changing fluid.
These cars have pretty solid rear differential, other than being a leaky sweaty one 😅 That sounds more like suspensiom issue. I’d check your struts for hydraulic fluid leaks, endlinks for play, the easy and obvious stuff and start from there.
Hello! please answer me one question. I purchased rear differential oil for a BMW M340i hypoid axle oil g4. This oil was previously green in color and had a viscosity of about 75W-80. Now the oil is yellow in color and its viscosity is somewhere around 75W-140. Can you tell me if this is how it should be? I can't find information anywhere... Could it be a fake…?
I don’t really have a thorough answer for you, unfortunately. But speaking from experience while doing the video, the genuine BMW Hypoid G4 fluid should be in green-ish color (I bought from a local reputable dealership). Can’t really tell its viscosity though. However, the rear diff fluid I changed on my F30 (open rear diff) was yellow/gold in color. I want to assume that’s probably what you got, which is not compatible with our limited slip rear diff. Yet again I cannot be sure. Hope this answers at least a fair bit of your question, and that you will find a compatible fluid for your application!
Appreciate your comment! I generally use BMW OEM fluid for differentials and transfer case. Specifally, G4 for the rear diff. I’ve heard BMW diffs and tcase are picky at what fluid you are feeding it. Doing OEM to play it safe. I’d say OEM is definitely not the best for performance, there are better fluids out there for sure. But they are designed for these applications so they are the “safest” bet we can make IMO.
@@iliketakingshowers I have also heard good things about others running Amsoil Severe Gear with their M340 rear diff with good results (or at least unnoticeable difference which also is a good thing)! I'm actually doing the other way around than you are. Running OEM fluid on both diffs and going to do Amsoil (blue cap) for my transmission. Worth noting my transmission is tuned with xHP and it's naturally running higher temp than OEM application. I'm running Amsoil as my tuner suggested that it has properties that resist thermal breakdown in higher temp than OEM trans fluid (ZF Lifeguard 8). Something to note if you have/plan to run xHP transmission tune!
@@robertgranat6335 Amsoil ATF Blue Cap, Product# ATLQTC-EA. My ZF8 has an xHP flash tuned by Sutphin Tuning, and he recommends either this or the Adrenaline SS for tuned applications.
The general idea of changing rear differential fluid is to:
1. Jack up the vehicle, ensure it is leveled
2. Remove Fill Plug first
3. Remove Drain Plug after
or
3. Siphon the old fluid out from the Fill Plug via a hook-shaped adapter, or a flexible hose
4. Pump the new fluid until it overflows from the fill hole
5. Wait for a couple of minutes until the overflow calms down and becomes dripping
6. Install a new Fill Plug
7. Lower the vehicle to the ground, start the vehicle to ensure there is no fault code
8. Go around the block, double-check to ensure there is no leak from both the Fill Plug and the Drain Plug
--------------------
Tools Required (BMW M340i RWD & AWD & Supra MK5 A90/A91 & 40i with Limited Slip Rear Differential):
- Jack & Jack Stands (or Wood Blocks)
- Wheel Chocks
- 14mm Hex Socket (Fill Plug)
- 17mm Deep Socket (Temp Sensor)
- Torque Wrench, that can do 14 Nm & 60 Nm respectively
- Any type of fluid transfer pump
- Hook-Shaped Hose Adapter or Flexible Hose
- Disposable Gloves
--------------------
Torque Spec:
- Fill Plug: 60 Nm
- Temperature Sensor: 14 Nm (Supra manual asks for 13.5 Nm)
--------------------
Your support means the world to me. If you like the video, please give it a thumbs-up, share it with your friends who need this, and subscribe to my channel!
By no means am I a professional mechanic, I am also trying to learn as I go, and to learn from my mistakes. If you do have any input or question, please feel free to drop them in the comments. I will try to address them as best as I can.
Damn bro she dirty down there
Thank you so much for the video! You're awesome🥹 do you also change front diff fluid as well?
I really appreciate your kind words! Yes, I do plan on doing that in the soon future, along with transmission fluid!
I already have the fluid sitting in my garage, but life got in the way lol. I’ll try to get them done and edit the videos ASAP! 😉
Almost time to do this myself!
It’s really as easy as it seems, you can do this!!
hi! great video! thanks for sharing the knowledge. question: is it really necessary to buy 3 botlles of the fluid? how much did you actually end up using? I've read some people were able to use 700-900ml of the new fluid only...
Thank you for the kind words, appreciate you too!
I’m almost willing to bet, those people siphoned the old fluid from the fill plug, not knowing the temp sensor can be taken out and act as a drain.
As far as the volume of fluid goes, I don’t think it’s necessary to get 3 bottles, but I’d recommend it.
Great video, the fluid looked pretty dirty. Does it feel any different now with fresh fluid?
To be honest, no noticeable difference before and after. But IMO that’s a good thing , it simply means the rear differential was not having any problem before changing fluid.
On my g20 m340i on low speeds when turning i hear a clunk sound from the rear. Any ideas
These cars have pretty solid rear differential, other than being a leaky sweaty one 😅
That sounds more like suspensiom issue. I’d check your struts for hydraulic fluid leaks, endlinks for play, the easy and obvious stuff and start from there.
Hello! please answer me one question. I purchased rear differential oil for a BMW M340i hypoid axle oil g4. This oil was previously green in color and had a viscosity of about 75W-80. Now the oil is yellow in color and its viscosity is somewhere around 75W-140. Can you tell me if this is how it should be? I can't find information anywhere... Could it be a fake…?
I don’t really have a thorough answer for you, unfortunately. But speaking from experience while doing the video, the genuine BMW Hypoid G4 fluid should be in green-ish color (I bought from a local reputable dealership). Can’t really tell its viscosity though.
However, the rear diff fluid I changed on my F30 (open rear diff) was yellow/gold in color. I want to assume that’s probably what you got, which is not compatible with our limited slip rear diff. Yet again I cannot be sure.
Hope this answers at least a fair bit of your question, and that you will find a compatible fluid for your application!
@@TandeGarage Thank you so much!
Great video! What fluid did you use?
Appreciate your comment! I generally use BMW OEM fluid for differentials and transfer case. Specifally, G4 for the rear diff.
I’ve heard BMW diffs and tcase are picky at what fluid you are feeding it. Doing OEM to play it safe.
I’d say OEM is definitely not the best for performance, there are better fluids out there for sure. But they are designed for these applications so they are the “safest” bet we can make IMO.
@@TandeGarage I think I'm going to do amsoil for diff and OEM for the trans
@@iliketakingshowers I have also heard good things about others running Amsoil Severe Gear with their M340 rear diff with good results (or at least unnoticeable difference which also is a good thing)!
I'm actually doing the other way around than you are. Running OEM fluid on both diffs and going to do Amsoil (blue cap) for my transmission. Worth noting my transmission is tuned with xHP and it's naturally running higher temp than OEM application. I'm running Amsoil as my tuner suggested that it has properties that resist thermal breakdown in higher temp than OEM trans fluid (ZF Lifeguard 8).
Something to note if you have/plan to run xHP transmission tune!
@@TandeGarage which Amsoil fluid exactly do you recommend for the transmission tuned with XHP? thanks in advance.
@@robertgranat6335 Amsoil ATF Blue Cap, Product# ATLQTC-EA.
My ZF8 has an xHP flash tuned by Sutphin Tuning, and he recommends either this or the Adrenaline SS for tuned applications.