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      08-27-2013, 06:02 AM   #1
MFKN3
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Diff & Trans fluid

Has anyone replaced their transmission (6MT) or diff fluids and have any feedback? I am also thinking of trying equivalent Redline fluids instead of OEM. Also looks like a simple DIY.

Am looking at redline D4 ATF and 75w-140 with redline FM additive (like OEM).

I used Royal Purple in my previous 6MT with great results, it also got rid of the clunky 1st to 2nd shift that all BMW's seem to have.
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      08-27-2013, 08:19 AM   #2
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I have used the redline atf in my 6mt, and at 1st i didnt notice much difference tbh.

After about a week though, it seemed to slowly improve shifts. I use to occasionally have difficulties selecting 1st gear from a stop during bumper to bumper traffic but since i put some fresh redline in it has improved this also.

You will only need 2L of the atf, and its $10L in the usa.

With the diff oil, I bought the genuine bmw fluid which has been specifically formulated for the m3 diff as some diffs were 'grinding' at low speeds:



Trouble is that this fluid is extremely expensive!!!
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      08-27-2013, 06:39 PM   #3
MFKN3
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Sure is!

The FM is a LSD friction modifier and several other companies make it as a separate additive. It can actually be quite damaging to the seals too. I've been told it's only needed if you get diff chatter, but if I don't use OEM, I am thinking of using 4% to mimic OEM fluid.

For S65, we need 1.25L for diff and 2.5L for trans
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      08-28-2013, 03:53 AM   #4
MMMGuy
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Quote:
Originally Posted by MFKN3 View Post
I used Royal Purple in my previous 6MT with great results, it also got rid of the clunky 1st to 2nd shift that all BMW's seem to have.
Was that the RP Synchromax?......cheers..
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      08-28-2013, 03:55 AM   #5
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Was that the RP Synchromax?......cheers..
I believe RP syncromax is actually not compatible?
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      08-28-2013, 03:58 AM   #6
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Quote:
Originally Posted by MFKN3 View Post
Sure is!

The FM is a LSD friction modifier and several other companies make it as a separate additive. It can actually be quite damaging to the seals too. I've been told it's only needed if you get diff chatter, but if I don't use OEM, I am thinking of using 4% to mimic OEM fluid.
That fluid is actually oem fluid these days for E9X M3's and 1M's (its been confirmed by a few owners who dont trust the lifetime fluid guarantee and have had their fluid changed at the dealer here in australia) so I doubt its damaging to seals etc and only to be used for diffs which grind.
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      08-28-2013, 05:58 AM   #7
MFKN3
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Quote:
Originally Posted by MMMGuy View Post
Was that the RP Synchromax?......cheers..
Yeah buddy, but an N54. I wouldn't put it in the S65


Quote:
Originally Posted by DR-JEKL View Post
That fluid is actually oem fluid these days for E9X M3's and 1M's (its been confirmed by a few owners who dont trust the lifetime fluid guarantee and have had their fluid changed at the dealer here in australia) so I doubt its damaging to seals etc and only to be used for diffs which grind.
I don't understand. Are you saying the OEM fluid is the one with the FM additive, because I thought we covered that?

From what I am told, BMW use the FM enriched fluid in all S65 to presumably minimise customer complaints. Strictly speaking you really only require it if the diff is a bit chattery, because FM fluid is not all positives. It probably depends on machining tolerances and driving conditions too I suppose. I'm going to use it, because it can't be too bad if OEM use it and I expect diffs to wear out anyway
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      08-28-2013, 06:01 AM   #8
MFKN3
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Quote:
Originally Posted by DR-JEKL View Post
I believe RP syncromax is actually not compatible?
I'd probably consider Redline over RP. Their fluids seem so highly regarded, especially amongst bmw race clubs where they have also developed a 10w-60. I wouldn't be surprised if a lot of their R&D and approvals supersede some of the ancient BMW approvals
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      09-05-2013, 12:05 AM   #9
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Did you go ahead with Redline?
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      09-05-2013, 05:25 AM   #10
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Quote:
Originally Posted by EarthboundMisfit View Post
Did you go ahead with Redline?
Not yet
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      09-05-2013, 05:52 AM   #11
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I picked up some redline diff and ATF fluid.. Will swap it out on Sunday and give my impressions
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      09-14-2013, 11:39 PM   #12
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Am also thinking about what fluids to put in next. Has anyone tried Penrite fluids in their car (for brakes, LSD, transmission, radiator)? If so, comparisons with OEM?
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      09-19-2013, 01:53 AM   #13
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I've heard good things about penrite, a diff shop in town rate it, but I'm not sure about M's.

The Redline "75w140 High Performance" actually contains friction modifiers and lists it for use in BMW M's.

I'm going to give redline a try in near future
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      09-27-2013, 11:54 PM   #14
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I'm keen to do this as a DIY job, but would really like to get the car up on to a hoist or lift. Ramps, jacks and stands are a bit of a pain.

Does anyone have, or know someone with, a lift or hoist I might be able to use?
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      10-11-2013, 02:03 AM   #15
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Got Red Line fluids today. Went for MTL for the trans, and 75W140 for the diff. Will put these in before the Morgan Park track day.
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      12-19-2013, 06:35 AM   #16
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H

How have you found it since MP? Any improvement?

Duane
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      12-19-2013, 05:35 PM   #17
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Quote:
Originally Posted by EarthboundMisfit View Post
I'm keen to do this as a DIY job, but would really like to get the car up on to a hoist or lift. Ramps, jacks and stands are a bit of a pain.

Does anyone have, or know someone with, a lift or hoist I might be able to use?
I do my oil change on ramps/jack and not difficult at all. Some elbow grease. Save nearly $350 each time and gives the incentive to change oil frequently rather than waiting for CBS. Maximum 2 hour job. You will enjoy it. Unlike at the dealer when the oil is drained cold which leads to some sludge remaining in the pan, you can warm up the oil, and then every bit of it. When I change oil I top it up with 9 litres, because I am anal, and syringe out oil from the filter too.

Next is transmission and diff oil and will be tackling that soon because I have to go in for a shoulder surgery, and won't be able to do any of this for a good two years.

Unless I win lotto and but the new M3. Otherwise, with a five-year-old coming along after the purchase of this car, I am broke and no chance of getting a new one. Hence the reason I am very anal about doing everything perfectly to prolong the longevity of this ultimate Driving Machine.
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      12-22-2013, 04:39 AM   #18
EarthboundMisfit
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Quote:
Originally Posted by DuaneTh View Post
H

How have you found it since MP? Any improvement?

Duane
Hi Duane.

Other than the piece of mind knowing that fresh fluids are in the diff and transmission, I haven't really noticed much of a difference in the transmission, but the diff is a bit quieter (still some grinding when cold and in tight, slow turns, but no longer as loud).

When the old fluids were drained from diff and trans, they came out really "clean" with no metal shavings or the like.

Cheers,
H.
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      12-22-2013, 07:46 AM   #19
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I did a major service on my car when I bought it
OEM fluid in the 6mt and castrol Syntrax in the diff. Fuck that friction modified rubbish, it limits the effective locking of your diff by making the clutch's slippery.
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