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#4709295 - 03/28/18 08:30 AM Diff gear oil viscosity
WyrTwister Offline


Registered: 01/13/13
Posts: 1246
Loc: Texas
I live in south central USA , Texas . Winter , rarely into the teens , summer , over 100F not uncommon .

If the owners manual specs 75W-90 , is there any down soide to using a " thicker " lube . Like this ;

https://shop.advanceautoparts.com/p/valv...rchTerm=85W+140

Thanks , :-)
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#4709301 - 03/28/18 08:35 AM Re: Diff gear oil viscosity [Re: WyrTwister]
CT8 Offline


Registered: 10/09/14
Posts: 10577
Loc: Idaho
If you have no leaks run a 75W-140 syn lube if you desire thicker. The 85W-140s are much thicker than the 75W-140 when cool.
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#4709316 - 03/28/18 08:44 AM Re: Diff gear oil viscosity [Re: WyrTwister]
WyrTwister Offline


Registered: 01/13/13
Posts: 1246
Loc: Texas
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Wyr
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#4709328 - 03/28/18 08:52 AM Re: Diff gear oil viscosity [Re: WyrTwister]
JLawrence08648 Offline


Registered: 01/20/17
Posts: 165
Loc: NJ
The only differential oil I would buy is synthetic.

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#4709336 - 03/28/18 08:59 AM Re: Diff gear oil viscosity [Re: WyrTwister]
CT8 Offline


Registered: 10/09/14
Posts: 10577
Loc: Idaho
Originally Posted By: WyrTwister
Or Mobil or Amsoil etc.
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#4709349 - 03/28/18 09:08 AM Re: Diff gear oil viscosity [Re: WyrTwister]
SOHCman Offline


Registered: 03/29/10
Posts: 1283
Loc: USA
Is this a Ford? Regardless of the manual I believe all Ford diffs have been back spaced to 75-140 synthetic across the board. Any of the major brands will give you good service.
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#4709391 - 03/28/18 09:53 AM Re: Diff gear oil viscosity [Re: WyrTwister]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1309
Loc: Alberta
75-140 if you wish, for warm climates, but Synthetic only please. You won't regret it.

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#4709435 - 03/28/18 10:33 AM Re: Diff gear oil viscosity [Re: WyrTwister]
LeakySeals Offline


Registered: 02/18/11
Posts: 6517
Loc: Hudson, NH
Not sure down there. Was for me in NE. Made the truck sluggish, MPG went down by 2. Clunky in and out of gear. And counter to what i thought, it would drip at the drive shaft seal. Couldn't breath as well though the vent? no idea really. All of this went away going back to 75w90
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06 Escalade 6.0L AWD 155k. M1 EP 5w30 Fram TG
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#4709488 - 03/28/18 11:27 AM Re: Diff gear oil viscosity [Re: SOHCman]
WyrTwister Offline


Registered: 01/13/13
Posts: 1246
Loc: Texas
Originally Posted By: SOHCman
Is this a Ford? Regardless of the manual I believe all Ford diffs have been back spaced to 75-140 synthetic across the board. Any of the major brands will give you good service.


1991 Chevy Caprice .
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Wyr
God bless

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#4709491 - 03/28/18 11:29 AM Re: Diff gear oil viscosity [Re: LeakySeals]
WyrTwister Offline


Registered: 01/13/13
Posts: 1246
Loc: Texas
Originally Posted By: LeakySeals
Not sure down there. Was for me in NE. Made the truck sluggish, MPG went down by 2. Clunky in and out of gear. And counter to what i thought, it would drip at the drive shaft seal. Couldn't breath as well though the vent? no idea really. All of this went away going back to 75w90


Did it do that both winter and summer ? What is the winter temps in NE ?
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Wyr
God bless

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#4709540 - 03/28/18 12:18 PM Re: Diff gear oil viscosity [Re: WyrTwister]
Alex_V Offline


Registered: 04/10/16
Posts: 1119
Loc: Campbellsville, KY
I had 85w140 in my '85 GMC's 14-bolt full-floating rear end for about 30K, and when I drained it out last year I wasn't particularly impressed - dark film on everything and what looked like scuffing on the gear teeth. Put in Amsoil 75w110 and the difference was surprising. I think it's safe to say Amsoil severe gear 75w90 is so much better than what came in your car that it's the last thing that'll cause wear in the axle.
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#4709562 - 03/28/18 12:34 PM Re: Diff gear oil viscosity [Re: WyrTwister]
MolaKule Offline


Registered: 06/05/02
Posts: 18956
Loc: Iowegia - USA
I always recommend a Synthetic 75W110 because it offers a slightly thicker fluid film than does a 75W90 and you won't get a large mileage hit.

75W110's such as:

https://www.redlineoil.com/75w110-gl-5-gear-oil or

https://www.amsoil.com/lit/databulletins/g2043.pdf
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#4709663 - 03/28/18 01:55 PM Re: Diff gear oil viscosity [Re: WyrTwister]
LeakySeals Offline


Registered: 02/18/11
Posts: 6517
Loc: Hudson, NH
Originally Posted By: WyrTwister
Originally Posted By: LeakySeals
Not sure down there. Was for me in NE. Made the truck sluggish, MPG went down by 2. Clunky in and out of gear. And counter to what i thought, it would drip at the drive shaft seal. Couldn't breath as well though the vent? no idea really. All of this went away going back to 75w90


Did it do that both winter and summer ? What is the winter temps in NE ?

I noticed a drop in MPG over the summer. Some mild clunking but not enough to take action. Winter I just didn't like the way the drive train felt. Summer is 75-100f avg 80s. Winter is -10F to 30F. Avg 20s.
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06 Escalade 6.0L AWD 155k. M1 EP 5w30 Fram TG
03 Maxima 3.5L Unknown miles ST 10w30

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#4709737 - 03/28/18 03:17 PM Re: Diff gear oil viscosity [Re: WyrTwister]
WyrTwister Offline


Registered: 01/13/13
Posts: 1246
Loc: Texas
Sounds like you may be about 10F colder than we are . And we may be about 10F warmer than you are .
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Wyr
God bless

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#4709962 - 03/28/18 07:21 PM Re: Diff gear oil viscosity [Re: WyrTwister]
LeakySeals Offline


Registered: 02/18/11
Posts: 6517
Loc: Hudson, NH
I would have thought the temp difference was more.
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06 Escalade 6.0L AWD 155k. M1 EP 5w30 Fram TG
03 Maxima 3.5L Unknown miles ST 10w30

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