[Rup91]

Hello guys! About to perform the 50k mile service for the front, rear differential and the transfer case. Front and rear diff look pretty simple. Upon reading my service manual, I wanted to see if anyone could explain this portion in more detail please regarding the transfer case.

Change Transfer Box Oil:

• Run the "oil change" service function with the BMW diagnosis
system during the oil change to ensure that the VTG is drained and
filled completely.



Do I need special equipment for this or is this something I can do via Bimmerlink.

Thanks in advance!

[Demon Barber]

My understanding is that it's just a simple drain and fill to the level of the fill plug. Just make sure you use the right fluid, part number 83-22-2-409-710. Then reset the transfer case fluid sensor with a scan tool.

[micvite]

Originally Posted by Rup91

Hello guys! About to perform the 50k mile service for the front, rear differential and the transfer case. Front and rear diff look pretty simple. Upon reading my service manual, I wanted to see if anyone could explain this portion in more detail please regarding the transfer case.

Change Transfer Box Oil:

• Run the "oil change" service function with the BMW diagnosis
system during the oil change to ensure that the VTG is drained and
filled completely.



Do I need special equipment for this or is this something I can do via Bimmerlink.

Thanks in advance!

You're supposed to use ISTA to do it, it cycles the transfer case solenoids to empty it out completely and will tell you what to do after you fill it and at what temperature and stuff like that.

[Demon Barber]

Originally Posted by micvite

You're supposed to use ISTA to do it, it cycles the transfer case solenoids to empty it out completely and will tell you what to do after you fill it and at what temperature and stuff like that.

Interesting. I'm not doubting you, but I'm just curious where you got this information. I've never encountered a BMW transfer case that requires cycling solenoids to drain fluid. You can also always replace the same volume you remove, and while it may not be all of it, it would still be beneficial.

[micvite]

Originally Posted by Demon Barber

Interesting. I'm not doubting you, but I'm just curious where you got this information. I've never encountered a BMW transfer case that requires cycling solenoids to drain fluid. You can also always replace the same volume you remove, and while it may not be all of it, it would still be beneficial.

Well, personally haven't done it yet, since I don't have my car, and since I don't have a car to physically scan I can't tell you what is in the service plan, but here ya go. (per the bmw service manual). If I get one of these at my shop I can post exactly what the situation is and if it's needed or not. I was just guessing considering usually bmw just say drain it and fill it. but for example on the front diff it says DONT fill it until it starts leaking out the fill plug because that's considered over filled, you have to use exactly 600ml of fluid.



cant post pics... https://ibb.co/82rKm1M https://ibb.co/rf5KJgk https://ibb.co/xzcsxhx

[Demon Barber]

Originally Posted by micvite

Well, personally haven't done it yet, since I don't have my car, and since I don't have a car to physically scan I can't tell you what is in the service plan, but here ya go. (per the bmw service manual). If I get one of these at my shop I can post exactly what the situation is and if it's needed or not. I was just guessing considering usually bmw just say drain it and fill it. but for example on the front diff it says DONT fill it until it starts leaking out the fill plug because that's considered over filled, you have to use exactly 600ml of fluid.



cant post pics... https://ibb.co/82rKm1M https://ibb.co/rf5KJgk https://ibb.co/xzcsxhx

Thanks for the info. I'd love to see the instructions for the front and rear diffs as well if you can share them.

[Rup91]

Originally Posted by Demon Barber

Thanks for the info. I'd love to see the instructions for the front and rear diffs as well if you can share them.

Originally Posted by Demon Barber

Thanks for the info. I'd love to see the instructions for the front and rear diffs as well if you can share them.

Yep, had to use ISTA, the program will tell you what to do next.

[m_fife]

ISTA+ is required. Procedures for Front, Rear, and Xfer Case attached.

[pbonsalb]

Thanks for the pdfs! These jobs is on my list.

[Demon Barber]

Thanks so much for sharing, this is extremely helpful. I'm hoping I can get access to the fill plug on the transfer case without having to remove the support cross member, but we'll see.

[916_M5]

Originally Posted by m_fife

ISTA+ is required. Procedures for Front, Rear, and Xfer Case attached.

Am I reading these correctly? 600 mL front, 1 L rear , 1 L transfer ?