What gear oil for diffs? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 07-06-2012, 09:53 AM   #1
Jeeper
 
Join Date: Jun 2012
Posts: 282
What gear oil for diffs?

2012 JKU Sport, 6 spd manual, 3:73 and limited slip.

What gear oil do I want to run in my diffs? Please don't say Amsoil as I know it's great stuff, but I want something that is readily available at my local parts store. Something like Valvoline brand or Mobil 1 that is compatible with my warranty. Fully synthetic? Do I need any additive? Anyone know the capacities off hand?

Also, should I stick with 75W90 or should I maybe bump up to 75W140 due to running slightly bigger 285 70 R17 tires.

elToro is offline   Quote Quick Reply
Old 07-06-2012, 09:56 AM   #2
Supporting Member

WF Supporting Member
 
SilverSport's Avatar
 
Join Date: May 2011
Posts: 21,126
Send a message via Yahoo to SilverSport
I didn't say Amsoil.

IMHO run synthetic 75W-90; if you have the tow package or have added a receiver hitch and plan to tow use 75W-140 in the rear diff.

__________________
"Own a Jeep and own a piece of history."

"The Hunter is not concerned with the opinion of the Wolf."
SilverSport is offline   Quote Quick Reply
Old 07-06-2012, 10:06 AM   #3
Jeeper
 
Join Date: Jun 2012
Posts: 282
Thanks, I do have the tow package, but do not plan to tow really heavy or frequently. At most maybe a light trailer with a quad once in a while. What confuses me is the manual's mention of a Limited Slip additive requirement. Do I need an additive with fully synthetic oil? Some brands of oil say an additive is not necessary. Who's right? Any non-Amsoil brand really any better than anything else?
elToro is offline   Quote Quick Reply
Old 07-06-2012, 10:39 AM   #4
Jeeper
 
countrybassist's Avatar
 
Join Date: Sep 2011
Location: Washington PA
Posts: 365
I Just changed mine a few weeks ago to......A_S__L, 75w90. See I didn't day it, But on a serious note, I've heard RP and Mobile 1 are very good too. If you tow, I'd use the 75w140 in the rear. As far as an additive, I believe that the above memtioned brands already contain it, but I'm not 100% sure about that.
__________________
Northern by birth, Southern by choice.

It's better to be a hick than it is to be a dick.
countrybassist is offline   Quote Quick Reply
Old 07-06-2012, 10:54 AM   #5
CG3
no retreat, no surrender

WF Supporting Member
 
CG3's Avatar
 
Join Date: Jun 2011
Location: Utah/Mexico/California
Posts: 975
If you read what the companies (like Auburn) that MAKE the diffs say - you'll see they recommend *no synthetic*. And yes - you need an additive for the lsd.
__________________
Carolyn
CG3 is offline   Quote Quick Reply
Old 07-06-2012, 11:10 AM   #6
The Bad Guy

WF Supporting Member
 
daggo66's Avatar
 
Join Date: May 2009
Location: NJ exile living in Baltimore
Posts: 22,199
I've run RP and M1 in mine. I do tow so I run the 75W-140. The synthetics already have the LSD modifier in them.
__________________
Tom

"I've got two things in this world, my balls and my word and I don't break them for no one."
daggo66 is offline   Quote Quick Reply
Old 07-06-2012, 11:47 AM   #7
kik
Jeeper
 
kik's Avatar
 
Join Date: Dec 2008
Posts: 4,713
Images: 1
Quote:
Originally Posted by daggo66 View Post
I've run RP and M1 in mine. I do tow so I run the 75W-140. The synthetics already have the LSD modifier in them.
If I had the tow package I would go with this.
kik is offline   Quote Quick Reply
Old 07-06-2012, 02:12 PM   #8
Jeeper
 
Join Date: Jun 2012
Posts: 282
Quote:
Originally Posted by CG3 View Post
If you read what the companies (like Auburn) that MAKE the diffs say - you'll see they recommend *no synthetic*. And yes - you need an additive for the lsd.

See, this is what makes this decision so confusing. Dana makes no such recommendations that I am aware of. Lots of people seem to be running full synthetics wihout problem. And there are some that say you don't need LSD additive because it is already added, and some say you do. What gives?
elToro is offline   Quote Quick Reply
Old 07-06-2012, 02:31 PM   #9
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Chrysler recommends dino oil unless you are towing then they recommend the 75W-140 synthetic.

I have Yukon gears and they say "use a high quality name brand oil and fill the unit to the manufacturers recommended capacity. Synthetic oil is recommended for most applications".

Specification wise, Valvoline has gear oils (dino or synthetic) that are rated above the minimum GL-5 (MT-1 and SAE J2360).
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-06-2012, 02:34 PM   #10
Jeeper
 
Join Date: Jun 2012
Posts: 282
Quote:
Originally Posted by joe002 View Post

Specification wise, Valvoline has gear oils (dino or synthetic) that are rated above the minimum GL-5 (MT-1 and SAE J2360).
But do you need an additional additive? Does it meet Chrysler's specs?
elToro is offline   Quote Quick Reply
Old 07-06-2012, 02:41 PM   #11
Rock-Rubber

WF Supporting Member
 
GoldenSahara00's Avatar
 
Join Date: Aug 2010
Location: SCPA
Posts: 16,662
Quote:
Originally Posted by elToro View Post
But do you need an additional additive? Does it meet Chrysler's specs?

Check the bottle. It will say if there is an additive already or not.
__________________
Ryan - A good eye, a light foot, and a smart rig.
Bolt-ons are boring
AMERICAN JEEPER
My Build - http://www.wranglerforum.com/f118/pr...a00-74622.html
Rausch Creek Trip: 2014 Trip Coming Soon
GoldenSahara00 is offline   Quote Quick Reply
Old 07-06-2012, 02:46 PM   #12
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Quote:
Originally Posted by elToro View Post
But do you need an additional additive? Does it meet Chrysler's specs?
Chrysler says GL-5 is the minimum requirement. It's hard to find a gear oil that isn't GL-5. If the oil is also MT-1 and SAE J2360 then it's over and above GL-5.

Chrysler says Models equipped with Trac-Lok™ require an additive. If the oil has the correct additive it will indicate something like "Contains special additives to reduce chattering in limited-slip differentials" on the bottle. If you need the additive and are really concerned about it then I do not believe it would hurt to add it even though it may already be in the oil you buy.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-06-2012, 02:53 PM   #13
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
I missed the tires part - 75W-140 is recommended for towing, 75W-90 (actually 80W-90) otherwise. I run Valvoline SynPower Full Synthetic 75W-90 with my setup. Check the bottle and get the one that says "Limited Slip" on the front and GL-5, MT-1 (and SAE J2360) on the back.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-06-2012, 02:59 PM   #14
Jeeper
 
Join Date: Jun 2012
Posts: 282
Quote:
Originally Posted by joe002 View Post
I missed the tires part - 75W-140 is recommended for towing, 75W-90 (actually 80W-90) otherwise. I run Valvoline SynPower Full Synthetic 75W-90 with my setup. Check the bottle and get the one that says "Limited Slip" on the front and GL-5, MT-1 (and SAE J2360) on the back.

Thanks Valvoline is easy to find. Did you add Chrysler's LS additive, or did you "trust" what it says on the bottle that it contains the necessary additive?

I'm just concerned what Chrysler would say and if it came down to it, if they would void a warranty claim because I did not use their additive.
elToro is offline   Quote Quick Reply
Old 07-06-2012, 03:10 PM   #15
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Quote:
Originally Posted by elToro View Post
Thanks Valvoline is easy to find. Did you add Chrysler's LS additive, or did you "trust" what it says on the bottle that it contains the necessary additive?

I'm just concerned what Chrysler would say and if it came down to it, if they would void a warranty claim because I did not use their additive.
I don't have Limited Slip, so I don't need the additive.

On the SynPower Gear Oil bottle it says it's for Limited Slip, and on-line they say "The addition of a supplemental friction modifier (Ford M2C-118-A, Chrysler MS-5630, or GM 1052358) is not required." If you look at most of the synthetic bottles they say they are good for limited slip. I haven't read, yet, that anyone had a problem with using the additives that are already in these oils.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-06-2012, 03:24 PM   #16
Jeeper
 
RedBones's Avatar
 
Join Date: Jul 2011
Location: Wv
Posts: 2,756
Could you run 75w-140 in both front and rear axles????
__________________
14 JK WW
11 JK
03 TJ
97 TJ
95 YJ
RedBones is offline   Quote Quick Reply
Old 07-06-2012, 03:28 PM   #17
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Quote:
Originally Posted by RedBones View Post
Could you run 75w-140 in both front and rear axles????
You could do whatever you want. I know others here on the board run 75w-140 in both the front and rear and they have not reported any problems. Typically they are towing in 4WD.

Chrysler doesn't recommend it, and my gear guy only recommends 75w-140 if you are towing.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-06-2012, 03:45 PM   #18
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
elToro - A little more info on the additive… If the additive that comes in the oil isn’t working properly you will hear your LS clutches chatter around turns or when they un-lock. The friction modifier is supposed t make the locking and unlocking smooth. If you have too much additive then they won’t lock-up as often. How much is too much???
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-06-2012, 06:14 PM   #19
CG3
no retreat, no surrender

WF Supporting Member
 
CG3's Avatar
 
Join Date: Jun 2011
Location: Utah/Mexico/California
Posts: 975
If you have (I know you don't - this is purely fyi) ARB Air Lockers - you have to use gear oil *without* friction additives.
Grade is also a function of running (start up) temps - and since I live where the temps are below freezing (closer to zero) for months of the year, I would not use a gear oil rated to 140... And since I have have ARB lockers in front - no friction modifiers there (warned by manufacturer) - but lsd in the rear (that also locks - Auburn Ected-Max) friction modifiers are added there.
And I follow the manufacturers (ARB and Auburn) advice of dino - not synthetic.

Although I do use synthetic for my motor

I think each of us have different needs/uses/etc... and it's important to do your homework (like you are) - take it all with a grain of salt - then decide what's best for your circumstance. If you have a good mechanic you trust - or better yet, drive line shop, ask their opinion.

Now - is that all as clear as mud
__________________
Carolyn
CG3 is offline   Quote Quick Reply
Old 07-06-2012, 07:50 PM   #20
Supporting Member

WF Supporting Member
 
SilverSport's Avatar
 
Join Date: May 2011
Posts: 21,126
Send a message via Yahoo to SilverSport
FWIW a synthetic 75W-90 and synthetic 75W-140 will have similar cold flow characteristics. For A----l, the pour point of the 75W-90 is -54F and -51 for the 75W-140. To the OP: don't sweat this. You don't have aftermarket diffs. The owners manual does state to use synthetic 75W-140 in the rear diff for towing. Doesn't matter how often you tow. And 75W-90 in the front diff is fine. And like others have said, most of the synthetic gear oils already have the friction modifier for the LSD.
__________________
"Own a Jeep and own a piece of history."

"The Hunter is not concerned with the opinion of the Wolf."
SilverSport is offline   Quote Quick Reply
Old 07-07-2012, 10:52 AM   #21
Jeeper
 
Join Date: Jun 2012
Posts: 282
Ok so simple question... if I use Valvoline or Mobil 1 75w90 fully synthetic (with no additional additive)and don't plan on towing, will I be fine and keep my warranty intact?
elToro is offline   Quote Quick Reply
Old 07-07-2012, 11:34 AM   #22
Supporting Member

WF Supporting Member
 
SilverSport's Avatar
 
Join Date: May 2011
Posts: 21,126
Send a message via Yahoo to SilverSport
Yes.
__________________
"Own a Jeep and own a piece of history."

"The Hunter is not concerned with the opinion of the Wolf."
SilverSport is offline   Quote Quick Reply
Old 07-07-2012, 12:13 PM   #23
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Quote:
Originally Posted by elToro View Post
Ok so simple question... if I use Valvoline or Mobil 1 75w90 fully synthetic (with no additional additive)and don't plan on towing, will I be fine and keep my warranty intact?
As you know, I use the Valvoline 75w90. I recently had a problem with my lockers and my dealer covered the locker repair under warranty (the carrier was bad), and the oil I used had no impact on the warranty work. They actually didn't even ask what kind of oil I used.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote Quick Reply
Old 07-07-2012, 12:51 PM   #24
Jeeper
 
Join Date: Jun 2012
Posts: 282
Quote:
Originally Posted by joe002 View Post
As you know, I use the Valvoline 75w90. I recently had a problem with my lockers and my dealer covered the locker repair under warranty (the carrier was bad), and the oil I used had no impact on the warranty work. They actually didn't even ask what kind of oil I used.
Good to know. Thanks.

elToro is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 01:32 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC