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  #1  
Old 12-04-2016, 01:48 PM
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Gear oil question

Anyone use 75w-140 in their WK2 SRTs? I'm about to change my diff fluids and was contemplating switching from 75w-90 to 75w-140 but wanted to see if anyone had an opinion to share regarding that. I very rarely ever tow anything and I never have more than 2 other people in my jeep with me. But I do like to get on her quite a bit.

Was thinking of Amsoil Severe Gear 75w-140 or Royal Purple 75w-140....thoughts? And do I need the Mopar additive for the rear diff with either of those? Or do they have it in it?

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  #2  
Old 12-04-2016, 02:12 PM
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Re: Gear oil question

I'm not clear on this so just wanted to ask without me having to look up your SRT owners manual. Is the 75 w 140 recommended by the manufacturer as an option and what is your purpose for the change over what came in the vehicle? Thanks.
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Old 12-04-2016, 02:20 PM
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Re: Gear oil question

Axles, front and rear here:
Jeep Grand Cherokee WK2 - Maintenance information and schedules

Owners manual PDF (real owners manual, as opposed to the users guide they come with):
Sorry, I don't have your year.
Jeep Grand Cherokee WK2 - Brochures, manuals and literature
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Old 12-04-2016, 02:58 PM
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Re: Gear oil question

Quote:
Originally Posted by HAL3YSRT View Post
Anyone use 75w-140 in their WK2 SRTs? I'm about to change my diff fluids and was contemplating switching from 75w-90 to 75w-140 but wanted to see if anyone had an opinion to share regarding that. I very rarely ever tow anything and I never have more than 2 other people in my jeep with me. But I do like to get on her quite a bit.

Was thinking of Amsoil Severe Gear 75w-140 or Royal Purple 75w-140....thoughts? And do I need the Mopar additive for the rear diff with either of those? Or do they have it in it?
Your previous posts show a '14 SRT?

140? nah, unless u r running WOT in the desert in the summer that's too thick....manual is 75W-85 API GL-5...I use the Severe Gear 75w-90 API GL-5, it has no FM, and get zero chatter no friction modifier needed so far, see how she wears but suspect won't need any for life of diff....
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Old 12-04-2016, 03:05 PM
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Re: Gear oil question

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Originally Posted by HAL3YSRT View Post
And do I need the Mopar additive for the rear diff with either of those? Or do they have it in it?
The limited slip additive is required if you have the ELSD (electronic limited slip differential) -- required if you have it, a waste of money if you don't.
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Old 12-04-2016, 03:10 PM
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Re: Gear oil question

Yea I figured 75w-90 was good enough. Just curious is anyone was running it and noticed anything. I live in Vegas and get on it more times than not which is why I was considering. But most likely going to stay. Thanks for the correct Owners Manual tho. Ridiculous that they don't ship these out with the correct manual .
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Old 12-04-2016, 03:14 PM
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Re: Gear oil question

I also noticed in the manual you just linked, that it says use Mopar ATF+4 for the transfer case. Is that correct? I've always been told Mopar NV146 should be the only oil I use for the TC. Shit is ridiculously expensive but if that's the best, that's what I'm using.
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Old 12-04-2016, 03:14 PM
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Re: Gear oil question

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Originally Posted by Governor View Post
The limited slip additive is required if you have the ELSD (electronic limited slip differential) -- required if you have it, a waste of money if you don't.
not required per se as a spec, only to prevent chatter...if your clutches slip/engage without the clutch pop/chatter then it is not needed...
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Old 12-04-2016, 03:47 PM
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Re: Gear oil question

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Originally Posted by GoPlzGo View Post
not required per se as a spec, only to prevent chatter...if your clutches slip/engage without the clutch pop/chatter then it is not needed...
That's odd. The link from wk2jeeps states "Caution: ONLY use Mopar ELSD differential lubricant in the ELDS differential." This is located directly under the Mopar Gear and Axle Lubricant 75W-85 with Modifier. Mopar part # 68083381AA.

I'm curious if you are stating facts or your opinion? Can you provide a link? No offense, just trying to clarify. I was running the additive in 70's muscle cars and Ramcharger trucks in 70's and 80's. Still running it in my 98 Dakota limited slip. Just wondering what's changed since the old days.
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Old 12-04-2016, 04:00 PM
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Re: Gear oil question

Quote:
Originally Posted by HAL3YSRT View Post
I also noticed in the manual you just linked, that it says use Mopar ATF+4 for the transfer case. Is that correct? I've always been told Mopar NV146 should be the only oil I use for the TC. Shit is ridiculously expensive but if that's the best, that's what I'm using.
your owner's manual says to use ATF+4 for the TC...there are some variations on the diffs from launch onward as they spec what's available so i know the early 14's had I believe Fuchs/Catrol recommendations that shifted (in the manuals) to the Mopar 75W-85 as that came online and since the hardware did not change one could use what the manual says (or equiv) but I am pretty certain no manual has the NV146 listed for the WK2 MP3010 TC as that has been spec'd for ATF+4 from day 1...

I would get that nv146 out of there and put in ATF+4 asap and do a quicker than normal change after that again as it will be contaminated with remaining NV146 that could not be drained but that's just me being picky. There are many reports of clueless service techs cheaping out and putting ATF+4 in the WK1 TC's that took the NV146 so I would assume NV146 in your WK2 TC that takes ATF+4 would cause issues too....your manual clearly states ATF+4, right?

NV146 is not synthetic (has paraffin oil in it):

...worse cold weather/cold start performance
...much greater sludge production
...large dino particles than the synthetic molecules "may" (don't know for sure about true plumbing diffs) not reach all passages as required
...I am sure there are other significant differences.
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Old 12-04-2016, 04:12 PM
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Re: Gear oil question

Quote:
Originally Posted by Governor View Post
That's odd. The link from wk2jeeps states "Caution: ONLY use Mopar ELSD differential lubricant in the ELDS differential." This is located directly under the Mopar Gear and Axle Lubricant 75W-85 with Modifier. Mopar part # 68083381AA.

I'm curious if you are stating facts or your opinion? Can you provide a link? No offense, just trying to clarify. I was running the additive in 70's muscle cars and Ramcharger trucks in 70's and 80's. Still running it in my 98 Dakota limited slip. Just wondering what's changed since the old days.
Fact as it relates to "required".

Milous and the other insiders who maintain that do an awesome job but in the end it is only a reference. The owners manual is the official bible. The manual says "recommended".

So that then takes my answer to opinion based upon years of experience and the physical performance of the JGC ELSD/LSD's I have had. What has changed besides the alloy metals is the truly exotic nature of today's lubes. Many gear oils are flexible enough to not require additional fm's. Amsoil sells an fm "should your LSD develop chatter.." Mine never have and I have not seen anyone who uses Amsoil 75w-90 Syn SG oil develop it to require additional fm.

There are no warranty issues here as if there is a failure they must prove your lube caused the failure but they must do this BEFORE they deny your claim. If they deny a warranty claim for "not using Mopar blah blah" out of the gate they are in direct violation of the Moss-Mag Act and they must repair, its the law...really.

Truth be told the Mopar axle lubes are the exact same lube just the rear one has fm added that's all because their base fluid is not "exotic" enough to prevent chatter....
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  #12  
Old 12-04-2016, 05:34 PM
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Re: Gear oil question

So is the friction modifier in there or not needed at all? My 2011 manual only uses the term once - Mopar Synthetic Gear and Axle Lubricant or equivalent with friction modifier additive. This is describing the 3.6 (which was not even available in ELSD). The 5.7 calls for the Mopar oil without a reference to the additive, so I'm assuming you are absolutely correct unless I see something different. This is new info for me, I had never heard this before. Thanks for the hook up.
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