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Unread 02-03-2009, 06:13 AM   #1
NewAlbanyWJ
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Limited Slip Additive

I am going to be changing out my differential fluids this weekend...I have to change the front because I will be replacing the axle seals, the rear will just be maintenance. Do I have to buy the limited slip additive from the dealership, or does Autozone or Advance carry something similar?

I know some of you will say to just buy Royal Purple or Amsoil gear oil, but I've already bought, opened, and used some of the Mobil 1 because I had to add a little bit of fluid to the front diff due to the leaking seal. So I'd rather not spend any extra money on gear oil.

Thanks in advance...

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Unread 02-03-2009, 06:16 AM   #2
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Edit:

I see that Amsoil makes an additive. Would this be a good substitution for the Mopar? I work with an Amsoil dealer, so if I can use this instead I'll just do that.
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Unread 02-03-2009, 07:20 AM   #3
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Yes that will do the job & it's cheaper!
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Unread 02-03-2009, 07:29 AM   #4
Wheelin98TJ
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If you're using Mobil 1, you will not need limited slip additive.

Its already in there.
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Unread 02-03-2009, 07:33 AM   #5
NewAlbanyWJ
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Quote:
Originally Posted by Wheelin98TJ View Post
If you're using Mobil 1, you will not need limited slip additive.

Its already in there.
Really?? Well that's good to know. At $18 something per quart, it should already be in there.
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Unread 02-03-2009, 07:40 AM   #6
newfieZJ
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Quote:
Originally Posted by NewAlbanyWJ View Post
Really?? Well that's good to know. At $18 something per quart, it should already be in there.
I thought things were cheaper in the US , that`s the same price as here . I went with Royal Purple , I know it`s got a good rep , and , I got it for $15 a quart , no FM additive required .
I`d go with Amsoil if I was south of my boarder just because of the good representation from Ridin' Around , but shipping kills the deal here in Canada
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Unread 02-03-2009, 07:46 AM   #7
Wheelin98TJ
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Mobil 1 has an excellent reputation too. Its good stuff.

And it definitely has the limited slip additive already.
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Unread 02-03-2009, 10:50 AM   #8
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yep even tho i like amsoil thnx to ridin around i used M1 before i knew about amsoil yes $18 per qt atleast u dont need gallons of it i could image O_O
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Unread 02-03-2009, 10:53 AM   #9
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Quote:
Originally Posted by Wheelin98TJ View Post
Mobil 1 has an excellent reputation too. Its good stuff.

And it definitely has the limited slip additive already.
wow that interesting
so what happens if u use mobile 1 and put in the fm?
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Unread 02-03-2009, 10:55 AM   #10
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I always thought mobil1 didnt have any FM, cause the dealerships always sold that with the fm.
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Unread 02-03-2009, 11:14 AM   #11
xJoshxx
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Quote:
Originally Posted by BLACKzj52 View Post
wow that interesting
so what happens if u use mobile 1 and put in the fm?
i guess ull have SUPER FM NO FRICTON AT All!

I think m1 only the Higher grade stuff has the FM alrdy it has to say on the bottle for it have it

i just used 70w140 it didnt sayanything about it but i also have dana 30/35 with out trac locks
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Unread 02-03-2009, 01:16 PM   #12
Wheelin98TJ
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Quote:
Originally Posted by BLACKzj52 View Post
wow that interesting
so what happens if u use mobile 1 and put in the fm?
Too much friction modifier will make the limited slip work less effectively.

Quote:
Originally Posted by WA_WJ View Post
I always thought mobil1 didnt have any FM, cause the dealerships always sold that with the fm.
Dealerships rarely use mobil 1. They just fill from the drums and use additives.

Quote:
Originally Posted by xJoshxx View Post
i guess ull have SUPER FM NO FRICTON AT All!

I think m1 only the Higher grade stuff has the FM alrdy it has to say on the bottle for it have it

i just used 70w140 it didnt sayanything about it but i also have dana 30/35 with out trac locks
ALL Mobil 1 has the friction modifier already.

Mobil 1 is the higher grade stuff. There are not 2 different levels of Mobil 1 oil.

They do not make a 70-140, but there is a 75-140 Mobil 1.

http://www.mobil.com/USA-English/Lub..._LS_75W-90.asp

http://www.mobiloil.com/USA-English/...75W-140LS.aspx
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Unread 02-03-2009, 01:52 PM   #13
xJoshxx
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Quote:
Originally Posted by Wheelin98TJ View Post
Too much friction modifier will make the limited slip work less effectively.


Dealerships rarely use mobil 1. They just fill from the drums and use additives.



ALL Mobil 1 has the friction modifier already.

Mobil 1 is the higher grade stuff. There are not 2 different levels of Mobil 1 oil.

They do not make a 70-140, but there is a 75-140 Mobil 1.

http://www.mobil.com/USA-English/Lub..._LS_75W-90.asp

http://www.mobiloil.com/USA-English/...75W-140LS.aspx
so i miss type Oh i see now the bottle says 75w140
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Unread 02-18-2009, 11:55 AM   #14
jondilly1974
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Dumb question here, but what are the capacities for the front and rear differentials on the 2000 WJ 4.0l 4x4? Need to now how much to buy.
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Unread 02-18-2009, 12:08 PM   #15
Wheelin98TJ
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Below are the fluid capacities.

1 quart = 2 pints


wj-fluid-capacities.jpg
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