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Mobil 1 75w90 LS for 2010 Camaro SS #4111640 05/31/16 05:51 PM
Joined: May 2016
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AIRJAC3 Offline OP
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Anyone on the board have any experience with the Mobil 1 75w90 LS rear gear oil? Specifically was a friction modifier needed on top of the additive already present in it? I'm looking to change out the fluid in my Camaro SS rear end but want to know if I need the modifier as well.

I've seen some other posts about it and it seems like it's a car by car basis. Some people needed it. Some didn't. But these were older threads.

Any info would be helpful.

Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4111656 05/31/16 06:09 PM
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CapitalTruck Offline
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For my '13 Silverado you just use Synthetic 75w90. Even with the limited slip you DON'T add friction modifier.


2013 Silverado 4.8L VVT 4x4 97k mi - ACDelco Dexos Full Synthetic 5w30 (ExxonMobil variant), ACDelco PF48E
Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4111678 05/31/16 06:32 PM
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MrHorspwer Offline
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Your owners manual recommends P/N 89021677, which is a synthetic 75W90, with friction modifier P/N 88900330.

P/N 89021677 has been superseded by P/N 88900401.

Personally, I would use 88900401 with 88900330.

If you're set on Mobil 1, I would add the faction modifier. Say you skip it and develop some type of chatter. Now you get the fun project of extracting enough fluid to add the modifier or dumping the entire diff and refilling. Adding it isn't going to hurt anything (other than the cost) and you may save yourself a headache down the road.

Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4111699 05/31/16 06:56 PM
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dailydriver Offline
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What limited slip (company and type) did the factory install in the 5th gen's center??


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4111736 05/31/16 07:30 PM
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buck91 Offline
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I would ASSume they are using a torsen like the 4th gen's had... but maybe not. I know GM uses Eaton posi's (clutch type) in a lot of vehicles, too.

Interesting note. Since I am about to install an eaton posi I have been talking to their tech support a bit. Despite the literature which accompanied my posi Eaton clearly informed me pretty much any 80w90, 75w90 or 75w140 is fine for their posi. They also STRONGLY advised adding 4oz of any friction modifier you choose, regardless of whether your gear oil states it already has FM added.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4111786 05/31/16 08:35 PM
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MrHorspwer Offline
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2010 Camaro uses an AAM TracRite PC limited slip. PC = Plate Clutch

Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4112470 06/01/16 01:49 PM
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My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
~ PJ Plauger
Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: AIRJAC3] #4112493 06/01/16 02:15 PM
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MolaKule Offline
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Originally Posted By: AIRJAC3
Anyone on the board have any experience with the Mobil 1 75w90 LS rear gear oil? Specifically was a friction modifier needed on top of the additive already present in it? I'm looking to change out the fluid in my Camaro SS rear end but want to know if I need the modifier as well.

I've seen some other posts about it and it seems like it's a car by car basis. Some people needed it. Some didn't. But these were older threads.

Any info would be helpful.


If this is a pre-owned vehicle or one with more than run-in mileage, it would be on a car-by-car basis.

Refill the vehicle's diffy with the Mobil 1 LS fluid and then listen closely for any chattering on Figure 8 turns.

If no chattering, no extra FM needed.

If chattering occurs, add only 1 ounce of FM additive at a time until the chattering disappears.

Most people tend to over treat their diffys using FM additives.

Last edited by MolaKule; 06/01/16 02:19 PM.

The value of a scientific theory is its ability to prompt further study, not that it has any relation to the established facts of scientific reality.
Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: MrHorspwer] #4112661 06/01/16 05:26 PM
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dailydriver Offline
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Originally Posted By: MrHorspwer
2010 Camaro uses an AAM TracRite PC limited slip. PC = Plate Clutch


Thanks, I guess it is AAM's answer to the Ford Trac Loc?


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: Mobil 1 75w90 LS for 2010 Camaro SS [Re: buck91] #4112663 06/01/16 05:31 PM
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dailydriver Offline
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Originally Posted By: buck91
Interesting note. Since I am about to install an eaton posi I have been talking to their tech support a bit. Despite the literature which accompanied my posi Eaton clearly informed me pretty much any 80w90, 75w90 or 75w140 is fine for their posi.


Yes, I have been using a synthetic based gear oil for 13 of the last 15 years mine has been in this car (and for ~165K miles), with NO problems whatsoever. smile


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
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