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      08-09-2018, 02:25 PM   #1
alex91
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Transmission and Rear Diff oil

Guys,

It's time for me to get the transmission and rear differential oil changed.

Out of the following three, which one would you recommend for transmission oil (for a 6 speed) and rear differential fluid. Also, how many quartz needed for each change?

Liqui moly
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Castrol

Thanks!
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      08-09-2018, 03:38 PM   #2
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Motul is also a good option
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      08-13-2018, 10:48 AM   #3
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Anybody?
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      08-14-2018, 07:31 AM   #4
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BMW changed my diff oil on the last service, it was usually £50 but they did it FOC! might be worth asking
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      08-14-2018, 03:22 PM   #5
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Quote:
Originally Posted by alex91 View Post
Guys,

It's time for me to get the transmission and rear differential oil changed.

Out of the following three, which one would you recommend for transmission oil (for a 6 speed) and rear differential fluid. Also, how many quartz needed for each change?

Liqui moly
Red line
Castrol

Thanks!
For manual 6spd... Royal Purple Synchromax
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      08-16-2018, 01:10 PM   #6
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I've used Motul for Trans and Castrol for Differential. Seems to be perfect!
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      08-16-2018, 01:27 PM   #7
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Originally Posted by Fast400 View Post
I've used Motul for Trans and Castrol for Differential. Seems to be perfect!
Thank you, Fast400
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      08-18-2018, 10:37 AM   #8
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FCP Euro has a nice package deal. Check it out.

I don’t think you can go wrong with any of those brands.
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      08-18-2018, 08:13 PM   #9
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Originally Posted by 2Live4 View Post
FCP Euro has a nice package deal. Check it out.

I don’t think you can go wrong with any of those brands.
Thanks, 2life4. Looks like a good source for products and competitive prices.

In case anyone is doing the differential and the manual oil change, I ended up going with what Castrol SAF-XJ 75w-140 for the differential and Pentosin MTF2 75w-80 for the manual transmission.

Both are what the BMW is using and recommends.
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      04-30-2019, 09:24 PM   #10
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Just want to bump this to the top, was considering changing the fluid in my M6's manual trans and just curious what other experience people had. Hard to find information on this topic.
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      05-01-2019, 11:12 AM   #11
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The rear diff looks easy, and of the four top choices out there, you can't really go wrong.

https://f10.m5post.com/forums/showthread.php?t=1462144
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      05-01-2019, 11:30 AM   #12
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Quote:
Originally Posted by Marcus Frost View Post
Just want to bump this to the top, was considering changing the fluid in my M6's manual trans and just curious what other experience people had. Hard to find information on this topic.
For the 6MT it is safe to use whatever you liked in any previous 6MT BMW. For me, I'll be changing mine shortly with Mobil 1. I've used Royal Purple syncromesh in my e39 M5 and it was great when new but it degraded quickly. Since I do a lot of driving/miles I switched to a more common fill (the Mobil 1) and have been happy. For a complete change, you need ISTA to cycle the cooler pump. It's not necessary, but I would shortly your change intervals if you can't cycle the pump to change that fluid too.

I run Valvoline 75w-140 limited slip fluid in the diff. The only difference with the F10 versus older diff's is the change interval... much shorter on the F10. They want to keep the solenoids clean. That's the same reason it's important to change the brake fluid regularly. So many systems are controlled using the brake hydraulics.
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      05-02-2019, 12:13 AM   #13
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Quote:
Originally Posted by technician117 View Post
For the 6MT it is safe to use whatever you liked in any previous 6MT BMW. For me, I'll be changing mine shortly with Mobil 1. I've used Royal Purple syncromesh in my e39 M5 and it was great when new but it degraded quickly. Since I do a lot of driving/miles I switched to a more common fill (the Mobil 1) and have been happy. For a complete change, you need ISTA to cycle the cooler pump. It's not necessary, but I would shortly your change intervals if you can't cycle the pump to change that fluid too.

I run Valvoline 75w-140 limited slip fluid in the diff. The only difference with the F10 versus older diff's is the change interval... much shorter on the F10. They want to keep the solenoids clean. That's the same reason it's important to change the brake fluid regularly. So many systems are controlled using the brake hydraulics.
I just learned that we have the trusty ol ZF GS6-53bz in our cars. I'm guessing we have some slight variant because of the increased torque output of our motors but generally it seems to be a common transmission.

I've only got 29k on my car so the trans fluid is not extremely urgent, was really just creating a discussion. Have you researched the CDV? Holy hell talk about something that will ruin your day, especially on a tuned car...
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      05-02-2019, 03:50 AM   #14
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when to change transmission & differential fluid ? 80km?
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      05-02-2019, 05:27 AM   #15
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Quote:
Originally Posted by Marcus Frost View Post
I just learned that we have the trusty ol ZF GS6-53bz in our cars. I'm guessing we have some slight variant because of the increased torque output of our motors but generally it seems to be a common transmission.

I've only got 29k on my car so the trans fluid is not extremely urgent, was really just creating a discussion. Have you researched the CDV? Holy hell talk about something that will ruin your day, especially on a tuned car...
The CDV has ruined my day a couple times. This is the first (and last) generation M5 to have a CDV. It appears to be a standard type like other ones they use. I was planning to first try and remove it all together and just reattach the line. There's no way to tell if the threads are different because it's not listed on RealOEM with specs. My clutch line rubber hose is seeping I think so I'm replacing it and will try to remove or modify the CDV at that time.
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      05-02-2019, 05:31 AM   #16
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Quote:
Originally Posted by Mr. M6 View Post
when to change transmission & differential fluid ? 80km?
Diff fluid should be changed every 20-30k miles per BMW. The actual "spec" calls for every 3rd oil change, but keep in mind that the oil change interval is based on their timing... like 13k miles or something dumb. So although we may change our engine oil more frequently, there's no reason to change the diff fluid on the same shortened scale.

The 6MT I'd recommend every 50k miles.

Last edited by technician117; 05-05-2019 at 06:49 AM.. Reason: updated info to more specific
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      05-04-2019, 12:02 AM   #17
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Quote:
Originally Posted by technician117 View Post
The CDV has ruined my day a couple times. This is the first (and last) generation M5 to have a CDV. It appears to be a standard type like other ones they use. I was planning to first try and remove it all together and just reattach the line. There's no way to tell if the threads are different because it's not listed on RealOEM with specs. My clutch line rubber hose is seeping I think so I'm replacing it and will try to remove or modify the CDV at that time.
I bought the CDV delete valve from Zechausen Racing and it will be installed next week. $30 part. Highly recommend the people over there.

What truly is maddening is that in conjunction with the relatively aggressive timing of my DME tune, you had the perfect storm of when the CDV is NOT a good thing. By letting off the clutch and then quickly engaging the throttle, I built boost very quickly - quicker than the time the clutch had to engage the flywheel because of the delay. The result then is essentially forced clutch slippage in a high torque situation, and I got it a lot because of this damned CDV. Since throttle position in the DME tuned is closely mapped to the increased timing, and of course I'm running additional boost - this is much worse than stock because when stomping the throttle after a shift there is a lot more torque being applied to the clutch. Now, since the clutch engagement is being delayed via this valve and I'm already on the throttle before the clutch is actually engaged (again, what the CDV is supposed to do) I'm not only beating the piss out of the clutch but I'm also unable to consistently row through gears quickly without the car freaking out.

I thought it was the clutch itself (which may still be an issue) but this CDV definitely played a big part. Looking forward to the results of this delete with a bunch of other tweaks I'm having done.
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      05-04-2019, 03:17 AM   #18
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Quote:
Originally Posted by technician117 View Post
Diff fluid should be changed every 20-30k miles per BMW. The actual "spec" calls for every other oil change, but keep in mind that the oil change interval is based on their timing... like 13k miles or something dumb. So although we may change our engine oil more frequently, there's no reason to change the diff fluid on the same shortened scale.

The 6MT I'd recommend every 50k miles.
my car will go in for service at 60k km soon and what i know they will change engine oil and filter + spark plugs at this service, anything more at 60k km?

when i asked them about transmission & differential fluid, they told me they will never change it its lifetime oil!!!
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      05-04-2019, 07:07 AM   #19
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Quote:
Originally Posted by Mr. M6 View Post
my car will go in for service at 60k km soon and what i know they will change engine oil and filter + spark plugs at this service, anything more at 60k km?

when i asked them about transmission & differential fluid, they told me they will never change it its lifetime oil!!!
Find a new dealer/shop that actually knows the F10 M5 platform then :-) It's stated very clearly in the training manual for the car that the rear diff should be serviced every 3rd oil change... I just looked it up again before posting to confirm. The manual does state no fluid change required for DCT but I would not follow that advice. Obviously the dealer isn't going to do it for you as a maintenance item. They most certainly should change the diff fluid at the appropriate interval.

Good Luck
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      05-04-2019, 09:23 AM   #20
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i'm no mechanic but i've had a lot of professionals tell me that when it comes to transmissions- if it aint broke dont touch it..

reason being, if a tranny is doing fine, its in a happy state .. but if you drain and flush a tranny thats happy, it may become angry. leaks may arise and buildup knocked loose and so on.

ive heard the same about changing oil. just drain and refill, dont flush.
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      05-05-2019, 02:41 AM   #21
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Quote:
Originally Posted by technician117 View Post
Find a new dealer/shop that actually knows the F10 M5 platform then :-) It's stated very clearly in the training manual for the car that the rear diff should be serviced every 3rd oil change... I just looked it up again before posting to confirm. The manual does state no fluid change required for DCT but I would not follow that advice. Obviously the dealer isn't going to do it for you as a maintenance item. They most certainly should change the diff fluid at the appropriate interval.

Good Luck
we have only one dealer here in Bahrain , i will check with them next service if not i will do it outside
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      05-05-2019, 06:43 AM   #22
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Quote:
Originally Posted by BeachM5nster View Post
i'm no mechanic but i've had a lot of professionals tell me that when it comes to transmissions- if it aint broke dont touch it..

reason being, if a tranny is doing fine, its in a happy state .. but if you drain and flush a tranny thats happy, it may become angry. leaks may arise and buildup knocked loose and so on.

ive heard the same about changing oil. just drain and refill, dont flush.
Completely false for any vehicle, regardless of make. "lifetime" for BMW is like 100k miles anyway. ALL fluids break down over time and also collect debris, etc. That debris will start to clog solenoids/passages or cause additional wear on parts. You must not have owned an e60 with an auto trans. They are notorious for transmission problems and most of them are caused by dirty fluid.

Quote:
Originally Posted by Mr. M6 View Post
we have only one dealer here in Bahrain , i will check with them next service if not i will do it outside
haha. Sorry to hear! If your diff fluid has never been changed, you're probably due!
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