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Diff gear oil viscosity #4709295
03/28/18 08:30 AM
03/28/18 08:30 AM
Joined: Jan 2013
Posts: 2,496
Texas
WyrTwister Offline OP
WyrTwister  Offline OP

Joined: Jan 2013
Posts: 2,496
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 , :-)


Wyr
God bless
Re: Diff gear oil viscosity [Re: WyrTwister] #4709301
03/28/18 08:35 AM
03/28/18 08:35 AM
Joined: Oct 2014
Posts: 13,284
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,284
Canyon County 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.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Diff gear oil viscosity [Re: WyrTwister] #4709316
03/28/18 08:44 AM
03/28/18 08:44 AM
Joined: Jan 2013
Posts: 2,496
Texas
WyrTwister Offline OP
WyrTwister  Offline OP

Joined: Jan 2013
Posts: 2,496
Texas


Wyr
God bless
Re: Diff gear oil viscosity [Re: WyrTwister] #4709328
03/28/18 08:52 AM
03/28/18 08:52 AM
Joined: Jan 2017
Posts: 433
NJ
JLawrence08648 Offline
JLawrence08648  Offline

Joined: Jan 2017
Posts: 433
NJ
The only differential oil I would buy is synthetic.

Re: Diff gear oil viscosity [Re: WyrTwister] #4709336
03/28/18 08:59 AM
03/28/18 08:59 AM
Joined: Oct 2014
Posts: 13,284
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,284
Canyon County Idaho
Originally Posted By: WyrTwister
Or Mobil or Amsoil etc.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Diff gear oil viscosity [Re: WyrTwister] #4709349
03/28/18 09:08 AM
03/28/18 09:08 AM
Joined: Mar 2010
Posts: 1,424
USA
SOHCman Offline
SOHCman  Offline

Joined: Mar 2010
Posts: 1,424
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.


I urge people not to wait 100K to change out the fluid in their transfer case units. -Kestas
Re: Diff gear oil viscosity [Re: WyrTwister] #4709391
03/28/18 09:53 AM
03/28/18 09:53 AM
Joined: Dec 2017
Posts: 3,917
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 3,917
SE British Columbia, Canada
75-140 if you wish, for warm climates, but Synthetic only please. You won't regret it.


If you want the job done right......do it yourself.
Re: Diff gear oil viscosity [Re: WyrTwister] #4709435
03/28/18 10:33 AM
03/28/18 10:33 AM
Joined: Feb 2011
Posts: 7,128
Hudson, NH
LeakySeals Offline
LeakySeals  Offline

Joined: Feb 2011
Posts: 7,128
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


06 Escalade 6.0L LQ9 AWD 165k M1 0w40
03 Maxima 3.5L POS 162k ST HM 10w30
05 Malibu Classic 108k Unk
Re: Diff gear oil viscosity [Re: SOHCman] #4709488
03/28/18 11:27 AM
03/28/18 11:27 AM
Joined: Jan 2013
Posts: 2,496
Texas
WyrTwister Offline OP
WyrTwister  Offline OP

Joined: Jan 2013
Posts: 2,496
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 .


Wyr
God bless
Re: Diff gear oil viscosity [Re: LeakySeals] #4709491
03/28/18 11:29 AM
03/28/18 11:29 AM
Joined: Jan 2013
Posts: 2,496
Texas
WyrTwister Offline OP
WyrTwister  Offline OP

Joined: Jan 2013
Posts: 2,496
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 ?


Wyr
God bless
Re: Diff gear oil viscosity [Re: WyrTwister] #4709540
03/28/18 12:18 PM
03/28/18 12:18 PM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
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.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Diff gear oil viscosity [Re: WyrTwister] #4709562
03/28/18 12:34 PM
03/28/18 12:34 PM
Joined: Jun 2002
Posts: 19,749
Iowegia - USA
MolaKule Offline
Global Moderator
MolaKule  Offline
Global Moderator

Joined: Jun 2002
Posts: 19,749
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


"I can't change the direction of the wind, but I can adjust my sails to always reach my destination." Jimmy Dean
Re: Diff gear oil viscosity [Re: WyrTwister] #4709663
03/28/18 01:55 PM
03/28/18 01:55 PM
Joined: Feb 2011
Posts: 7,128
Hudson, NH
LeakySeals Offline
LeakySeals  Offline

Joined: Feb 2011
Posts: 7,128
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.


06 Escalade 6.0L LQ9 AWD 165k M1 0w40
03 Maxima 3.5L POS 162k ST HM 10w30
05 Malibu Classic 108k Unk
Re: Diff gear oil viscosity [Re: WyrTwister] #4709737
03/28/18 03:17 PM
03/28/18 03:17 PM
Joined: Jan 2013
Posts: 2,496
Texas
WyrTwister Offline OP
WyrTwister  Offline OP

Joined: Jan 2013
Posts: 2,496
Texas
Sounds like you may be about 10F colder than we are . And we may be about 10F warmer than you are .


Wyr
God bless
Re: Diff gear oil viscosity [Re: WyrTwister] #4709962
03/28/18 07:21 PM
03/28/18 07:21 PM
Joined: Feb 2011
Posts: 7,128
Hudson, NH
LeakySeals Offline
LeakySeals  Offline

Joined: Feb 2011
Posts: 7,128
Hudson, NH
I would have thought the temp difference was more.


06 Escalade 6.0L LQ9 AWD 165k M1 0w40
03 Maxima 3.5L POS 162k ST HM 10w30
05 Malibu Classic 108k Unk
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