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Rear diff fluid question #4778812
06/06/18 07:23 AM
06/06/18 07:23 AM
Joined: Jun 2018
Posts: 2
GA
bigdawglanecreek Offline OP
bigdawglanecreek  Offline OP
Joined: Jun 2018
Posts: 2
GA
2012 Jeep Grand Cherokee / 2wd / auto 5.7 hemi. The rear diff fluid needs changing and I am getting conflicting information. Not an ELSD and manual calls for Mopar 75w-85 synthetic, which is hard to find in the stores. They sell is for $45.00 per quart.

Will Mobile 1, 75w-90 full syn with friction modifier be ok to run in rear diff?

Thanks

Re: Rear diff fluid question [Re: bigdawglanecreek] #4778828
06/06/18 07:47 AM
06/06/18 07:47 AM
Joined: May 2005
Posts: 10,359
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content
Joined: May 2005
Posts: 10,359
ROCHESTER, NY
IMO, yes! The difference is too small between the two. Mobil 1's website may even have an application list for many vehicles and the site may even recommend their 75W90 LS for your JGC.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Rear diff fluid question [Re: bigdawglanecreek] #4778829
06/06/18 07:48 AM
06/06/18 07:48 AM
Joined: Sep 2015
Posts: 2,313
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,313
Malaysia

Re: Rear diff fluid question [Re: bigdawglanecreek] #4778835
06/06/18 08:00 AM
06/06/18 08:00 AM
Joined: Dec 2013
Posts: 2,093
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,093
socal
You can get Delo syn 75w90 from autozone around $6/qt. It does not contain LS. Works perfect in my vehicles and the price is right


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Rear diff fluid question [Re: bigdawglanecreek] #4778845
06/06/18 08:16 AM
06/06/18 08:16 AM
Joined: May 2005
Posts: 10,359
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content
Joined: May 2005
Posts: 10,359
ROCHESTER, NY
Well, unless your GC's differential actually requires synthetic gear lube, I bought PEAK 80W90 gear oil w/limited slip additive for ~ $15/gallon at PEP BOYS. I thought this was quite a deal at their regular price. It may be a slightly higher price now.

If you can use any regular(non syn) gear oil, I'd look online for the best price.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Rear diff fluid question [Re: bigdawglanecreek] #4778858
06/06/18 08:29 AM
06/06/18 08:29 AM
Joined: Dec 2006
Posts: 4,219
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,219
Port Orange, Florida
75w 90 gear oil is the same stuff. Synthetic is important.
75w90 exceeds your manufacturer specifications.
People in warm climates that tow alot could even go to 75w120 synthetic oil.
Over thinking the whole thing like 5w20 v.s 5w30.
Like the difference between soda and lemonade.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: Rear diff fluid question [Re: bigdawglanecreek] #4778860
06/06/18 08:31 AM
06/06/18 08:31 AM
Joined: Sep 2013
Posts: 10,524
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,524
Indiana
The LSD additive in a non LSD diff won't hurt a thing. Since the manual calls for 75w90, I'd say it requires synthetic so I'd stick with it regardless.

Mobil 1, Synpower, Supertech, Delo etc. would work great here.


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Rear diff fluid question [Re: bigdawglanecreek] #4778875
06/06/18 08:46 AM
06/06/18 08:46 AM
Joined: Jun 2018
Posts: 2
GA
bigdawglanecreek Offline OP
bigdawglanecreek  Offline OP
Joined: Jun 2018
Posts: 2
GA
Thanks for all the responses. It does call for GL-5 synthetic...probably go with Mobile 1 or Royal Purple.

Re: Rear diff fluid question [Re: bigdawglanecreek] #4778878
06/06/18 08:48 AM
06/06/18 08:48 AM
Joined: Dec 2005
Posts: 9,992
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 9,992
Upper Midwest
Definitely not Mobile 1. Use a known brand.


1994 BMW 530i, 231K
1996 Honda Accord, 263K
1999 Toyota Sienna, 402K
2000 Toyota ECHO, 272K
Re: Rear diff fluid question [Re: bigdawglanecreek] #4778894
06/06/18 09:09 AM
06/06/18 09:09 AM
Joined: Feb 2014
Posts: 2,522
Canada
Lolvoguy Offline
Lolvoguy  Offline
Joined: Feb 2014
Posts: 2,522
Canada
Agreed, Mobil 1 is far more reputable


06 Lexus IS350- Wife
88 BMW 325is- Mistress
Re: Rear diff fluid question [Re: Lolvoguy] #4778898
06/06/18 09:19 AM
06/06/18 09:19 AM
Joined: Sep 2010
Posts: 7,077
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,077
Texas
Originally Posted By: Lolvoguy
Agreed, Mobil 1 is far more reputable


Have used it in Eaton lockers for 20 years … I run it for 3 years/30k … but only dump it that often because it’s easy (aftermarket cover) and I cross flowing water periodically …

Re: Rear diff fluid question [Re: bigdawglanecreek] #4778955
06/06/18 10:33 AM
06/06/18 10:33 AM
Joined: Apr 2017
Posts: 1,122
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 1,122
SF BAY AREA, CA
Originally Posted By: bigdawglanecreek
Thanks for all the responses. It does call for GL-5 synthetic...probably go with Mobile 1 or Royal Purple.


As much as I like Royal Purple motor oil and filters I used their gear oil in a differential once and I really didn't like it. I'd stick with Valvoline, Mobil, or generic stuff (Supertech, Masterpro, etc)

Last edited by dogememe; 06/06/18 10:34 AM.

2010 Ford Escape FWD 2.5 ~90K Miles
Currently: Royal Purple 5W-30, Wix 51348
My favorite oil brands: Royal Purple, Valvoline, Castrol, O'Reilly.
Re: Rear diff fluid question [Re: bigdawglanecreek] #4779151
06/06/18 01:55 PM
06/06/18 01:55 PM
Joined: Aug 2017
Posts: 147
Displaced Texan in Mexico City
Gimpy1 Offline
Gimpy1  Offline
Joined: Aug 2017
Posts: 147
Displaced Texan in Mexico City
Royal Purple made the diff in my GTO sound like a tin can full of rocks, it also caused the dreaded "one wheel peel" after having the diff blueprinted, rebuilt and a TurTrac added, my builder recommend Synthetic GL-5 and said Mobil 1 or any of the big name gear oils are fine, he also said Redline 75W140 NS (no FM) was some of the best out there. After shelling out $2800 bucks for a diff I decided to use Red Line 75W140 NS and 25 ml of "F" FM. I think you'll be fine with Mobil 1 but I can't recommend Royal Purple Gear oil based on my experience and my car, granted the GTO diff is a freak of nature cone type diff designed in the 60's for a freaking 6 cylinder Australian vehicle.

Last edited by Gimpy1; 06/06/18 01:56 PM.
Re: Rear diff fluid question [Re: Lolvoguy] #4780946
06/08/18 06:59 AM
06/08/18 06:59 AM
Joined: May 2005
Posts: 10,359
ROCHESTER, NY
Char Baby Online content
Char Baby  Online Content
Joined: May 2005
Posts: 10,359
ROCHESTER, NY
Originally Posted By: kschachn
Definitely not Mobile 1. Use a known brand.
Originally Posted By: Lolvoguy
Agreed, Mobil 1 is far more reputable


Mixed feelings here?


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX

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