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is Mopar Limited Slip Additive a must? #5464081 06/27/20 12:08 PM
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John344 Offline OP
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Greetings, I had a differential fluid change at the dealer? However, I suspected that the dealer didn't add the Limited Slip Additive even though the manual asks for it for my car for the rear differential? can I get away with not using it or I have to drain again and make sure to add the Limited Slip Additive? my car is Grand Cherokee 2018 Laredo 3.6.

Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464089 06/27/20 12:16 PM
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ABN_CBT_ENGR Offline
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Originally Posted by John344
Greetings, I had a differential fluid change at the dealer? However, I suspected that the dealer didn't add the Limited Slip Additive even though the manual asks for it for my car for the rear differential? can I get away with not using it or I have to drain again and make sure to add the Limited Slip Additive? my car is Grand Cherokee 2018 Laredo 3.6.


What makes you suspect this and did you come straight out and ask?

Is there a problem there now that did not exist before the change?

Re: is Mopar Limited Slip Additive a must? [Re: ABN_CBT_ENGR] #5464093 06/27/20 12:18 PM
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John344 Offline OP
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Originally Posted by ABN_CBT_ENGR
Originally Posted by John344
Greetings, I had a differential fluid change at the dealer? However, I suspected that the dealer didn't add the Limited Slip Additive even though the manual asks for it for my car for the rear differential? can I get away with not using it or I have to drain again and make sure to add the Limited Slip Additive? my car is Grand Cherokee 2018 Laredo 3.6.


What makes you suspect this and did you come straight out and ask?

Is there a problem there now that did not exist before the change?


I didn't see it in the system when they showed me the bill only the price for the fluid, and I asked them about it and he hesitated for a moment then he said Yes. So if it's crucial for the rear differential then I'm worried.

Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464100 06/27/20 12:24 PM
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Chris142 Offline
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Depending on the brand of fluid used it may have had the addative already in the oil.


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Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464107 06/27/20 12:30 PM
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ABN_CBT_ENGR Offline
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Originally Posted by John344
Originally Posted by ABN_CBT_ENGR
Originally Posted by John344
Greetings, I had a differential fluid change at the dealer? However, I suspected that the dealer didn't add the Limited Slip Additive even though the manual asks for it for my car for the rear differential? can I get away with not using it or I have to drain again and make sure to add the Limited Slip Additive? my car is Grand Cherokee 2018 Laredo 3.6.


What makes you suspect this and did you come straight out and ask?

Is there a problem there now that did not exist before the change?


I didn't see it in the system when they showed me the bill only the price for the fluid, and I asked them about it and he hesitated for a moment then he said Yes. So if it's crucial for the rear differential then I'm worried.


Its more likely in the fluid but to get peace of mind- call and verify

Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464114 06/27/20 12:38 PM
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Jethro_Bob Offline
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A limited slip differential is unavailable on a 2x4 v6 Laredo, and optional on a v6 4x4. If you do have an open diff the additive will not make a difference either way.

Note: link is a pdf.

https://www.jeep.com.au/content/dam...n_au/pdfs/MY18_WK_Buyer's%20Guide_v5.pdf

Re: is Mopar Limited Slip Additive a must? [Re: Chris142] #5464159 06/27/20 01:32 PM
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John344 Offline OP
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Originally Posted by Chris142
Depending on the brand of fluid used it may have had the addative already in the oil.


The brand was Mopar 75W-85

Re: is Mopar Limited Slip Additive a must? [Re: ABN_CBT_ENGR] #5464163 06/27/20 01:33 PM
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John344 Offline OP
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Originally Posted by ABN_CBT_ENGR
Originally Posted by John344
Originally Posted by ABN_CBT_ENGR
Originally Posted by John344
Greetings, I had a differential fluid change at the dealer? However, I suspected that the dealer didn't add the Limited Slip Additive even though the manual asks for it for my car for the rear differential? can I get away with not using it or I have to drain again and make sure to add the Limited Slip Additive? my car is Grand Cherokee 2018 Laredo 3.6.


What makes you suspect this and did you come straight out and ask?

Is there a problem there now that did not exist before the change?


I didn't see it in the system when they showed me the bill only the price for the fluid, and I asked them about it and he hesitated for a moment then he said Yes. So if it's crucial for the rear differential then I'm worried.


Its more likely in the fluid but to get peace of mind- call and verify


They used Mopar 75W-85 I'm not sure if it has this additive already or not, and to be honest, it was expensive for the each Liter

Re: is Mopar Limited Slip Additive a must? [Re: Jethro_Bob] #5464165 06/27/20 01:35 PM
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John344 Offline OP
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Originally Posted by Jethro_Bob
A limited slip differential is unavailable on a 2x4 v6 Laredo, and optional on a v6 4x4. If you do have an open diff the additive will not make a difference either way.

Note: link is a pdf.

https://www.jeep.com.au/content/dam...n_au/pdfs/MY18_WK_Buyer's%20Guide_v5.pdf



My Jeep has the Electronic Limited-Slip for the rear differential. It's already equipped with it? so does that make the additive really important?

Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464195 06/27/20 02:29 PM
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sloinker Offline
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Isn't electronic limited slip accomplished through brake application? If there are no ckutches/cones in the rear end then it doesn't need any additive.


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Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464275 06/27/20 04:02 PM
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Rand Offline
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If it has QuadraDrive II and the $800 electronic limited slip option its computer controlled. and not a brake type thing.

This is different from Quadratrac II

IIRC its only available in conjunction with the V8 option.


So I'd guess the OP is fine without additive.

I think the OP probably has the Wheel brake based system that doesnt require anything special in the open differential(s)

if you post a vin or window sticker it should be apparent what you have.
'
if you are paranoid with your vin
goto this website
https://researchmaniacs.com/VIN-Number-Lookup/WindowSticker/Jeep.html
then post the result here.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464337 06/27/20 05:18 PM
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newtoncd8 Offline
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Originally Posted by John344
Greetings, I had a differential fluid change at the dealer? However, I suspected that the dealer didn't add the Limited Slip Additive even though the manual asks for it for my car for the rear differential? can I get away with not using it or I have to drain again and make sure to add the Limited Slip Additive? my car is Grand Cherokee 2018 Laredo 3.6.



Unless you have a special order Laredo, your model doesn't have a Limited Slip and therefore, doesn't require the limited slip additive.

Some good reading: http://www.wk2jeeps.com/wk2_maintenance.htm#FAXLE


12 Jeep GC, 04 Lexus RX330, 77 MG-B
Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464376 06/27/20 06:01 PM
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Rand Offline
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it also looks like

MoparĀ® Gear and Axle Lubricant 75W-85 with Modifier
Mopar p/n 68083381AA

Note: A separate limited slip additive is NOT required.

I also doubt your jeep has the electronic limited slip anyway, since afaik it only comes with v8 quadra-drive II


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: is Mopar Limited Slip Additive a must? [Re: John344] #5464454 06/27/20 08:14 PM
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JRed Offline
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I know for a family member's Dakota with an LSD rear it was 100% necessary with any fluid besides the Mopar fluid that already had the modifier in it. It would bind and clunk like crazy without it.


06 Subaru Impreza WRX - Sold. The only mechanical thing I'll ever love.
07 Toyota Prius - Devourer of Oil
Re: is Mopar Limited Slip Additive a must? [Re: Rand] #5464600 06/28/20 02:14 AM
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John344 Offline OP
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Originally Posted by Rand
If it has QuadraDrive II and the $800 electronic limited slip option its computer controlled. and not a brake type thing.

This is different from Quadratrac II

IIRC its only available in conjunction with the V8 option.


So I'd guess the OP is fine without additive.

I think the OP probably has the Wheel brake based system that doesnt require anything special in the open differential(s)

if you post a vin or window sticker it should be apparent what you have.
'
if you are paranoid with your vin
goto this website
https://researchmaniacs.com/VIN-Number-Lookup/WindowSticker/Jeep.html
then post the result here.



I have searched my vin on the website and got nothing (Sorry, a Window Sticker is unavailable for this VIN) However, I'm quite sure that I have the Quadra-Drive II system includes Electronic Limited slip differential for rear axle and HDC.

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