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#4702740 - 03/22/18 07:03 AM Mobil 1 differential fluid?
lawnguy Offline


Registered: 08/17/14
Posts: 326
Loc: Florida
Mobil 1 75w140 differential fluid. Is this good stuff?


Edited by lawnguy (03/22/18 07:04 AM)

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#4702752 - 03/22/18 07:20 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
meep Offline


Registered: 02/20/07
Posts: 3583
Loc: Southeast
I prefer other brands. It's totally just my own unmeasured perception, but the last two times I've used M1 diff fluid, it seemed to me to drain out notably thinner than it was when I pumped it in. I've used Valvoline syn, Castrol syn, and Amsoil. All have been good.
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2018 F150
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#4702786 - 03/22/18 08:00 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
Char Baby Offline


Registered: 05/25/05
Posts: 10086
Loc: ROCHESTER, NY
I have only used M1 75W90 LS gear oil/diff fluid, and I like it! But as "meep" mentioned, there are others to consider as well.
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#4702787 - 03/22/18 08:00 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1911
Loc: SE British Columbia, Canada
I'll go to bat for Mobil 1. Have a look at their website. I recommend you check if there are any UOA's on it to check for any viscosity issues.


https://mobiloil.com/en/gear-lubricants/mobil-1-synthetic-gear-lube-ls

"Exceptional shear stability"







Edited by Snagglefoot (03/22/18 08:05 AM)

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#4702789 - 03/22/18 08:01 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
65f100 Offline


Registered: 09/18/11
Posts: 105
Loc: Oklahoma
I want to know why, in that particular grade, it is so much more expensive than its competitors.

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#4702795 - 03/22/18 08:09 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
Cujet Offline


Registered: 02/15/03
Posts: 7247
Loc: Jupiter, Florida
I've had great luck with M1 gear lubes in my turbocharged performance/race cars.
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#4702860 - 03/22/18 08:55 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
incognito_2u Offline


Registered: 12/15/16
Posts: 113
Loc: Long Island, N.Y.
Mobil 75W140 has been used in the diff's of the Jeep in my sig since it's first change. Never an issue.


Edited by incognito_2u (03/22/18 08:56 AM)
Edit Reason: Brand added
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2006 Jeep Commander 3.7 V6 -108k (PUP/XG3600)
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#4702889 - 03/22/18 09:18 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
Schmoe Offline


Registered: 05/12/03
Posts: 7279
Loc: Oklahoma
Nothing but M1 in the F150 differential along with some friction modifier.
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#4702925 - 03/22/18 09:45 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
I like it. But not the 75w140 weight. Lost almost 2 mpg. Went back to 75w90.
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#4702999 - 03/22/18 10:34 AM Re: Mobil 1 differential fluid? [Re: Schmoe]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1911
Loc: SE British Columbia, Canada
Originally Posted By: Schmoe
Nothing but M1 in the F150 differential along with some friction modifier.


Mobil 1 LS has the limited slip additive in it already if that helps.

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#4703184 - 03/22/18 12:59 PM Re: Mobil 1 differential fluid? [Re: lawnguy]
andyd Offline


Registered: 09/25/04
Posts: 7294
Loc: Marshfield , MA
It stopped the clutch chatter in the Borman 6's LSD. At 350 Kmiles, The diff worked well. Up until I used 0w20 for the Camrys, it was the only synthetic lube I've used.
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1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4704657 - 03/23/18 08:27 PM Re: Mobil 1 differential fluid? [Re: Snagglefoot]
irv Offline


Registered: 10/08/06
Posts: 1160
Loc: Oshawa, Ont. Canada
Originally Posted By: Snagglefoot
Originally Posted By: Schmoe
Nothing but M1 in the F150 differential along with some friction modifier.


Mobil 1 LS has the limited slip additive in it already if that helps.


Why I am leaning towards Mobil syn gear oil but also thinking about Amsoil Severe gear. Decisions, decisions?
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#4704864 - 03/24/18 04:24 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
Lubener Offline


Registered: 01/22/11
Posts: 2616
Loc: N.Ohio
Originally Posted By: lawnguy
Mobil 1 75w140 differential fluid. Is this good stuff?

It's gear oil. They all do the job effectively. If it meets your specs, any brand will do the job.
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#4707227 - 03/26/18 08:13 AM Re: Mobil 1 differential fluid? [Re: lawnguy]
john_pifer Offline


Registered: 07/08/12
Posts: 2032
Loc: Nashville, TN via Memphis
M1 75W-90 in my Tacoma V6. Drained FF @ 100K, refilled with M1, and just drained & refilled with M1 again at 200K. No issues. If I towed or hauled, I might change more often.
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#4707248 - 03/26/18 08:33 AM Re: Mobil 1 differential fluid? [Re: irv]
4WD Offline


Registered: 09/21/10
Posts: 6569
Loc: Texas
Have used M1 gear lube for 20 years but couple years back, went to Delvac 1 since it did not need the LS additives

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