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      04-22-2018, 12:49 PM   #1
EEBreh
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DIY: Manual Transmission Fluid Change

I saw there was a little demand for a DIY for changing the manual transmission fluid in our F22s. It's a pretty easy task in and of itself if you have the right tools. Do this at your own risk, I am not liable for any damages if something occurs because of this DIY.

You will need the following:

8MM socket
10MM socket
8MM Alllen socket
Torque wrench that is calibrated to 45nm
A fluid transfer pump (you can pick one up at your local auto store for ~$10)
~2 Liters of fluid. I used the OEM BMW fluid (MTF-LT-5), PN 83222239654. I ordered it online, you can probably get it from the dealer (15% off with a BMWCCA membership so join!)

1: Get the car on jackstands or a lift



2:Remove the plastic shield (held on by 8mm trim bolts and a 10mm plastic nut)



3: Circled in red is is the fill plug, circled in blue is the drain plug.



4:I blew out each hole with a little brake cleaner and then used an 8MM (edit: some claim 9mm for their car) allen to loosen the fill plug first. The reason for doing this is that you do not want to be SOL if you can't take the fill plug out after you have drained the existing fluid.

5:Loosen the drain plug, and fluid will come out. It is normal for it to smell funny.



6: Once it is fully drained, clean the plug and Torque it to 45NM



7: Remove the fill plug and using a fluid transfer pump, pump in approximately 1.2 liters liters of fluid or until it starts leaking out (about 1.2 liters)



8: If you slightly overfilled it, let the remaining oil drip out. clean and torque the fill plug to 45nm

9: Reinstall shield, take the car off ramps and drive away!

I noticed my car shifted a little better. BMW claims their MT fluid is lifetime...It has been shown that this is kind of BS. I change mine every 30k miles.

I hope this helps you guys out!

Last edited by EEBreh; 07-22-2021 at 12:55 PM..
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      04-22-2018, 01:29 PM   #2
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Thanks, want to do this soon.
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      04-25-2018, 10:05 AM   #3
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My car only has 17k miles, should I bother doing it now or wait till 30k like you?
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      04-25-2018, 11:27 AM   #4
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Quote:
Originally Posted by Quantumn View Post
My car only has 17k miles, should I bother doing it now or wait till 30k like you?
That's too early. Honestly, it's probably fine until 50K but if you drive your car very hard (as in you race often) then maybe do it around 25-30k mark.
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      04-25-2018, 12:37 PM   #5
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Quote:
Originally Posted by cxp213 View Post
That's too early. Honestly, it's probably fine until 50K but if you drive your car very hard (as in you race often) then maybe do it around 25-30k mark.
Thanks for the reply! I'll do it around 25k-30k then - I autocross, track and mountain drive my car so I guess I drive "moderaterly hard"
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      04-28-2018, 07:37 AM   #6
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I drive my car moderately hard as well and changed the fluid out at 71,321 miles. I also did a sample and sent it to Blackstone Labs. Here are the results.

I replaced the stock fluid with RedLine D4 ATF.
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      05-02-2018, 09:54 AM   #7
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Great info! Any other oil recommendation other than Redline?
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      05-02-2018, 09:59 AM   #8
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Quote:
Originally Posted by 1LegitM235i View Post
Great info! Any other oil recommendation other than Redline?
I've not changed fluids on my F22 but I've used Redline fluids religiously on my track toy and never had one issue. I also liked Torco, but Redline was usually my go-to brand.
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      05-02-2018, 12:47 PM   #9
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Quote:
Originally Posted by 1LegitM235i View Post
Great info! Any other oil recommendation other than Redline?
Im sticking with the BMW brand while it is under warranty because if the transmission blows up, i don't want them to take an oil sample and reject the warranty work. Ive used redline and swepco before In my porsche, both are excellent brands.
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      05-02-2018, 02:56 PM   #10
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Thx CXP213 and EEBreh! I'll try the Redline. I've used Royal Purple in my past BMWs before and that was pretty good.
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      12-17-2018, 04:01 PM   #11
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Quote:
Originally Posted by EEBreh View Post
I saw there was a little demand for a DIY for changing the manual transmission fluid in our F22s. It's a pretty easy task in and of itself if you have the right tools. Do this at your own risk, I am not liable for any damages if something occurs because of this DIY.

You will need the following:

8MM socket
10MM socket
8MM Alllen socket
Torque wrench that is calibrated to 45nm
A fluid transfer pump (you can pick one up at your local auto store for ~$10)
~2 Liters of fluid. I used the OEM BMW fluid (MTF-LT-5), PN 83222239654. I ordered it online, you can probably get it from the dealer (15% off with a BMWCCA membership so join!)

1: Get the car on jackstands or a lift



2:Remove the plastic shield (held on by 8mm trim bolts and a 10mm plastic nut)



3: Circled in red is is the fill plug, circled in blue is the drain plug.



4:I blew out each hole with a little brake cleaner and then used an 8MM allen to loosen the fill plug first. The reason for doing this is that you do not want to be SOL if you can't take the fill plug out after you have drained the existing fluid.

5:Loosen the drain plug, and fluid will come out. It is normal for it to smell funny.



6: Once it is fully drained, clean the plug and Torque it to 45NM



7: Remove the fill plug and using a fluid transfer pump, pump in approximately 1.2 liters liters of fluid or until it starts leaking out (about 1.2 liters)



8: If you slightly overfilled it, let the remaining oil drip out. clean and torque the fill plug to 45nm

9: Reinstall shield, take the car off ramps and drive away!

I noticed my car shifted a little better. BMW claims their MT fluid is lifetime...It has been shown that this is kind of BS. I change mine every 30k miles.

I hope this helps you guys out!
Great write up, I'll be doing mine this week with this. Only thing is that according to newtis your torque figure is wrong.

Here is the torque data (2AZ) and according to the Transmission designations for the GS6-45BZ it's a type K, which is 40nm torque.
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      12-17-2018, 04:03 PM   #12
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Quote:
Originally Posted by Quantumn View Post
My car only has 17k miles, should I bother doing it now or wait till 30k like you?
I have 17k and I'm doing it because it's noticeably less smooth than when I first got the car brand new. I never did my fluids at break in though so that might be why. I followed the BMW maintenance until now that I learned better.
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      12-17-2018, 04:58 PM   #13
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Quote:
Originally Posted by 42395_skyline View Post
Great write up, I'll be doing mine this week with this. Only thing is that according to newtis your torque figure is wrong.

Here is the torque data (2AZ) and according to the Transmission designations for the GS6-45BZ it's a type K, which is 40nm torque.
The M235i (and the M240i) has the GS6-37BZ which is actually a type H which doesn't help at all because the torque value is not listed...
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      12-18-2018, 02:41 AM   #14
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For the type “H” transmission in the M240i, it shows 35Nm if the fill/drain plug has an M18 thread, 25Nm if it has an M12 thread: https://www.newtis.info/tisv2/a/en/f...earbox/5s1E0XS
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      12-23-2018, 11:18 AM   #15
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Quote:
Originally Posted by EEBreh View Post
I saw there was a little demand for a DIY for changing the manual transmission fluid in our F22s. It's a pretty easy task in and of itself if you have the right tools. Do this at your own risk, I am not liable for any damages if something occurs because of this DIY.

You will need the following:

8MM socket
10MM socket
8MM Alllen socket
Torque wrench that is calibrated to 45nm
A fluid transfer pump (you can pick one up at your local auto store for ~$10)
~2 Liters of fluid. I used the OEM BMW fluid (MTF-LT-5), PN 83222239654. I ordered it online, you can probably get it from the dealer (15% off with a BMWCCA membership so join!)

1: Get the car on jackstands or a lift



2:Remove the plastic shield (held on by 8mm trim bolts and a 10mm plastic nut)



3: Circled in red is is the fill plug, circled in blue is the drain plug.



4:I blew out each hole with a little brake cleaner and then used an 8MM allen to loosen the fill plug first. The reason for doing this is that you do not want to be SOL if you can't take the fill plug out after you have drained the existing fluid.

5:Loosen the drain plug, and fluid will come out. It is normal for it to smell funny.



6: Once it is fully drained, clean the plug and Torque it to 45NM



7: Remove the fill plug and using a fluid transfer pump, pump in approximately 1.2 liters liters of fluid or until it starts leaking out (about 1.2 liters)



8: If you slightly overfilled it, let the remaining oil drip out. clean and torque the fill plug to 45nm

9: Reinstall shield, take the car off ramps and drive away!

I noticed my car shifted a little better. BMW claims their MT fluid is lifetime...It has been shown that this is kind of BS. I change mine every 30k miles.

I hope this helps you guys out!
A bit of caution: always remove the FILL plug first. Why? Let's say you remove the drain plug and can't get the fill plug out. Oooops! Otherwise, great write up. I'll be changing my car's 6MT transmission fluid before I head off to Virginia International Raceway for the first HPDE of the year.

I've used Redline lubes since the 1980's. Great products. However, Redline sez it doesn't have fluid suitable for our ZF 6MTs. I'll still with the spec'd fluid.
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      12-28-2018, 12:18 AM   #16
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Quote:
Originally Posted by Funwithdesign View Post
The M235i (and the M240i) has the GS6-37BZ which is actually a type H which doesn't help at all because the torque value is not listed...
Where did you find it shows GS6-37BZ?

Real OEM and Newtis shows GS6-45BZ for the M235i and M240i.

BMW of South Atlanta also has it listed as GS6-45BZ for F22.
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      12-28-2018, 11:31 AM   #17
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^ the link you posted above

"GS6-37BZ (new designation according to BMW Group Standard GS 90007)'

Unless I'm reading something incorrectly.
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      01-06-2019, 09:01 PM   #18
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Quote:
Originally Posted by Funwithdesign View Post
^ the link you posted above

"GS6-37BZ (new designation according to BMW Group Standard GS 90007)'

Unless I'm reading something incorrectly.
That link is just transmission designations which is a universal page they link to keep the info all in one place. I haven't checked every model but if you check the manual transmission designations page on the M235i, 4 series, 8 series they all bring up the same page so it looks like every single car links to that document.
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      01-06-2019, 10:45 PM   #19
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A search for the appropriate part by VIN and for model designation 2G13 (maps to 2G1C in the 4th to 7th character of the VIN) leads to GS6-45BZ-SHCK (part# 23-00-8-609-450) as the installed transmission for my 2017 M240i.
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      01-20-2019, 07:42 PM   #20
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I don't see any pics? Am I missing something?
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      06-23-2019, 01:12 AM   #21
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Yea, what happened to the pics ?
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      11-02-2019, 09:13 PM   #22
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Nice, will be doing this and the differential fluid soon. Going with amsoil DCT which meets the BMW spec for LT5 and the pentosin specs.
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