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#3206688 - 12/04/13 09:09 PM GL5 with friction modifiers
redbone3 Offline


Registered: 06/09/12
Posts: 185
Loc: Reno, NV
I recently put Peak Limited Slip Synthetic 75-90 GL5 gear oil in my '95 Miata (Thorsen) axle. I understand the Thorsen axle doesn't require the LS oil. My thought was any rear axle is going to have very similar requirements for lubrication (still has a ring and pinion gear for example) so the LS type lube would be fine. Am I missing something?
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2014 Passat Wolfsburg, 1995 Miata.

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#3206728 - 12/04/13 09:45 PM Re: GL5 with friction modifiers [Re: redbone3]
brandini Offline


Registered: 10/08/09
Posts: 974
Loc: Richmond, VA
1 - Torsen
2 - LS additives will just do nothing if you don't have a clutch type LSD and they won't hurt anything
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#3207512 - 12/05/13 03:49 PM Re: GL5 with friction modifiers [Re: brandini]
Whitewolf Offline


Registered: 10/05/06
Posts: 1897
Loc: MI, USA
Originally Posted By: brandini
1 - Torsen
2 - LS additives will just do nothing if you don't have a clutch type LSD and they won't hurt anything


If your application doesn't require FM don't put it in because you CAN hurt something. They are needed for limited slip differentials but they are bad for oxidation and seals so you have to use just what is needed and no more. There is a DEXRON spec fluid that already contains FM and another that does not for that very reason. Both are commercially available and the list of suppliers can be found on gmdexron.com. They are both 75W-90 GL-5. Let me know if you can't find one.


Edited by Whitewolf (12/05/13 03:57 PM)
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#3207877 - 12/05/13 08:34 PM Re: GL5 with friction modifiers [Re: redbone3]
dailydriver Offline


Registered: 03/14/06
Posts: 7015
Loc: Bucks County, Pa.
I have heard people say NOT to use any LS FMs in Torsen diffs (due to there needing to be a certain level of friction between the worm gears and the case in order for there to be a torque biasing function-was the explanation).

But then GM has told people to add 4 ounces of their own LS FM fluid to the LS1 f bodies' T-2 Torsens to help quell the coast down "rocks in a box" sound some were making.

shrug
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#3207895 - 12/05/13 08:56 PM Re: GL5 with friction modifiers [Re: dailydriver]
Whitewolf Offline


Registered: 10/05/06
Posts: 1897
Loc: MI, USA
Who in GM said that? Torsen does not need or want FM.

Are these people talking to dealers to get this advice? We have been using Torsen diffs for years in Europe without problems so unless you have a different issue there is more to know. Tell me are you using this as a final diff or a centre diff?


Edited by Whitewolf (12/05/13 08:58 PM)
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#3207961 - 12/05/13 09:53 PM Re: GL5 with friction modifiers [Re: dailydriver]
Whitewolf Offline


Registered: 10/05/06
Posts: 1897
Loc: MI, USA
Torsens don't need or want FM. Maybe they are just recommending an inappropriate fluid. Which is why I asked where this recommendation is coming from. I need more information about the application, the specific vehicle and where this recommendation came from.


Edited by Whitewolf (12/05/13 09:58 PM)
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~ PJ Plauger

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#3208004 - 12/05/13 10:37 PM Re: GL5 with friction modifiers [Re: redbone3]
MolaKule Offline


Registered: 06/05/02
Posts: 14565
Loc: Midwest
Originally Posted By: redbone3
I recently put Peak Limited Slip Synthetic 75-90 GL5 gear oil in my '95 Miata (Thorsen) axle. I understand the Thorsen axle doesn't require the LS oil. My thought was any rear axle is going to have very similar requirements for lubrication (still has a ring and pinion gear for example) so the LS type lube would be fine. Am I missing something?


The Torsen diffy works on the principle of torque bias and the construction is composed of all gears and does not have clutches, so it does not need an additional LSD fluid.

http://www.youtube.com/watch?v=Z9iPqIQ_8iM

Just because it is called a Limited Slip Differential (LSD), this does NOT mean it needs an LSD additive.

As Whitewolf and others asked, "where is this information coming from?"

I suspect you are getting bad information.


Edited by MolaKule (12/05/13 10:41 PM)
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#3208019 - 12/05/13 11:02 PM Re: GL5 with friction modifiers [Re: redbone3]
jaj Offline


Registered: 08/21/03
Posts: 893
Loc: Vancouver, Canada
I don't know about GM, but Ford calls for XL-3 FM in their diff fluids for Torsen diffs in the late model Mustang Boss 302 and the GT500. Source is both the owner's manual and the shop manual. I presume they did it so that service techs didn't have to think when they service the rear axle.

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#3208043 - 12/05/13 11:43 PM Re: GL5 with friction modifiers [Re: jaj]
Whitewolf Offline


Registered: 10/05/06
Posts: 1897
Loc: MI, USA
What I have told you about FMs is not a point of debate but well proven information supported by data.
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My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
~ PJ Plauger

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#3208817 - 12/06/13 05:32 PM Re: GL5 with friction modifiers [Re: jaj]
MolaKule Offline


Registered: 06/05/02
Posts: 14565
Loc: Midwest
Originally Posted By: jaj
I don't know about GM, but Ford calls for XL-3 FM in their diff fluids for Torsen diffs in the late model Mustang Boss 302 and the GT500. Source is both the owner's manual and the shop manual. I presume they did it so that service techs didn't have to think when they service the rear axle.


Here is the only data I can find (so far) on the XL-3 FM:

Quote:
Description: Specially formulated additive to provide smooth operation of clutch-type limited-slip differentials.
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#3208829 - 12/06/13 05:42 PM Re: GL5 with friction modifiers [Re: Whitewolf]
redbone3 Offline


Registered: 06/09/12
Posts: 185
Loc: Reno, NV
I found this on the Torsen website:

Torsen for GM vehicles:

Is it true that the Torsen unit in the production Camaro needs the GM modifier added? Top of the Page

GM issued a technical bulletin adding modifier to the rear axle oil. This was done to quiet what we call a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. Elimination of the modifier does not affect durability of the differential.
_________________________
2014 Passat Wolfsburg, 1995 Miata.

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#3208891 - 12/06/13 06:46 PM Re: GL5 with friction modifiers [Re: redbone3]
Whitewolf Offline


Registered: 10/05/06
Posts: 1897
Loc: MI, USA
It depends on the advised change interval but it is well proven that FMs reduce the life of a gear oil when compared to a non FM version of the same formulation.
_________________________
My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
~ PJ Plauger

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#3209034 - 12/06/13 09:44 PM Re: GL5 with friction modifiers [Re: redbone3]
MolaKule Offline


Registered: 06/05/02
Posts: 14565
Loc: Midwest
Originally Posted By: redbone3
I found this on the Torsen website:

Torsen for GM vehicles:

Is it true that the Torsen unit in the production Camaro needs the GM modifier added? Top of the Page

GM issued a technical bulletin adding modifier to the rear axle oil. This was done to quiet what we call a "Rusty Screw" noise that we heard in a very small percentage of vehicles. This does not happen in all cases, however to address owner's concerns we asked that the modifier be used in all instances to insure that the driver would not get this noise. When replacing the fluid it is at the owner's discretion whether or not to add the modifier. Elimination of the modifier does not affect durability of the differential.


Does the GM tech bulletin mention a part number such as GM #88900330 or some other "modifier?"

The description for this product says:

Quote:
The additive reduces friction between your limited slip or positraction differential friction plates to eliminate the annoying chatter that is common with these types of units. This Chevrolet Performance limited slip lubricant additive not only quiets your rear-end, but it can also aid in your differential's ability to apply and release the clutch smoothly, creating a more pleasant and predictable power delivery.


There are no clutches in the Torsen.
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#3209145 - 12/07/13 12:39 AM Re: GL5 with friction modifiers [Re: MolaKule]
redbone3 Offline


Registered: 06/09/12
Posts: 185
Loc: Reno, NV
Maybe the product has more than one use? For example: Maalox is sold as a digestive product, but it can also be used on stainless steel bolts and nuts to prevent galling.
_________________________
2014 Passat Wolfsburg, 1995 Miata.

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#3209700 - 12/07/13 05:28 PM Re: GL5 with friction modifiers [Re: redbone3]
MolaKule Offline


Registered: 06/05/02
Posts: 14565
Loc: Midwest
Originally Posted By: redbone3
Maybe the product has more than one use? For example: Maalox is sold as a digestive product, but it can also be used on stainless steel bolts and nuts to prevent galling.


Right. I suspect the FM is used to reduce the "nails-in-a-can" noise found in some Torsen's.

Just trying to figure out how an LSD additive would affect this noise.
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