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85w90 vs 75w90 #5287346 12/06/19 11:24 PM
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Rohan Offline OP
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This is for front/rear differential for 2000 ml55 amg mercede. Can I use Amsoil 80w90 for front and rear or get 75w90 Amsoil? I know Motul gear 300 is 75w85 is good for rear. But idk.

I believe front called for: 85w90

And

Rear: 75w85

I’m having hard time choosing what brand of fluids should I go with. Money is not the issue since I only needed total of 3 qts for F/R.

Re: 85w90 vs 75w90 [Re: Rohan] #5287350 12/06/19 11:46 PM
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JEL01 Offline
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I’m guessing it specs the same 235.0 85w90 as my clk430 of that generation, if that’s the case you can get the liqui moly 235.0 85w90 as speced and approved by MBZ pretty cheaply on Amazon. It’s what I’ve been using for many years and it has served me well.

75w85 is the superseded spec for fuel economy and to standardize with the new cars, but really you just need (and probably want) the stuff they originally called for in those diffs when the ML was new


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: 85w90 vs 75w90 [Re: Rohan] #5287463 12/07/19 07:06 AM
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Snagglefoot Offline
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Your owners manual says 90 weight for the front and 90 weight or 85w90 for the rear.


If you want the job done right......do it yourself.
Re: 85w90 vs 75w90 [Re: Rohan] #5287469 12/07/19 07:21 AM
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Snagglefoot Offline
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I you wanted to run 75w90, I can’t imagine that would be a problem.

Last edited by Snagglefoot; 12/07/19 07:34 AM.

If you want the job done right......do it yourself.
Re: 85w90 vs 75w90 [Re: Rohan] #5287549 12/07/19 09:00 AM
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aquariuscsm Offline
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Use Amsoil Severe Gear 75W110.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 0W20

Re: 85w90 vs 75w90 [Re: aquariuscsm] #5287657 12/07/19 11:30 AM
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Gebo Offline
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Originally Posted by aquariuscsm
Use Amsoil Severe Gear 75W110.


I agree. 110 is what the old 90 was.


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
PP HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: 85w90 vs 75w90 [Re: Rohan] #5287896 12/07/19 05:13 PM
Joined: Jul 2005
Posts: 12,896
dave1251 Offline
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Originally Posted by Rohan
This is for front/rear differential for 2000 ml55 amg mercede. Can I use Amsoil 80w90 for front and rear or get 75w90 Amsoil? I know Motul gear 300 is 75w85 is good for rear. But idk.

I believe front called for: 85w90

And

Rear: 75w85

I’m having hard time choosing what brand of fluids should I go with. Money is not the issue since I only needed total of 3 qts for F/R.



If the gear oil meets the proper GL specs for the vehicle you can use what you want to use.


make the inside of your engine oil cap white.
don't use.
Re: 85w90 vs 75w90 [Re: Gebo] #5287897 12/07/19 05:14 PM
Joined: Jul 2005
Posts: 12,896
dave1251 Offline
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Originally Posted by Gebo
Originally Posted by aquariuscsm
Use Amsoil Severe Gear 75W110.


I agree. 110 is what the old 90 was.



Do we know what the viscosity of the factory fill was?


make the inside of your engine oil cap white.
don't use.
Re: 85w90 vs 75w90 [Re: Rohan] #5288516 12/08/19 01:00 PM
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Rohan Offline OP
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I don’t know what was factory fill was but only thing I know is front called for 85w90 and 75w85 for rear. I cannot find those number except liquid moly 85w90 and 75w85 on Motul 300.

Re: 85w90 vs 75w90 [Re: Rohan] #5288529 12/08/19 01:15 PM
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Posts: 11,447
4WD Offline
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Have a front/rear hair splitting difference with my two GM 4WD’s … probably since AAM specs the rear and I worry about the Eaton locker parts the most.
I just go with Delvac 1 75w90. If it’s good enough for HD equipment and the Porsche tracks boys … I don’t need no stinking Amsoil SG (and what it costs). Got the D1 for $32/gallon.

Re: 85w90 vs 75w90 [Re: Rohan] #5288917 12/08/19 09:09 PM
Joined: Sep 2015
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JEL01 Offline
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Originally Posted by Rohan
I don’t know what was factory fill was but only thing I know is front called for 85w90 and 75w85 for rear. I cannot find those number except liquid moly 85w90 and 75w85 on Motul 300.

Fuchs also makes an approved 75w85


Cars I maintain:
02 Mercedes CLK430
09 Honda Accord V6
13 Lexus RX350 AWD
02 Toyota Tundra 4x4
18 Lexus GX460
Re: 85w90 vs 75w90 [Re: Rohan] #5288965 12/08/19 10:19 PM
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Oro_O Offline
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Absolutely run and 80w90 in the front and 75w90 in the rear. No problem. You could really run either, in both. The difference are small and akin to running a 10w-30 vs. 15w-30 engine oil. And in Tennessee, it becomes less of an issue. Climate matters, don't let that "5w-30 everywhere" Mafia cloud your judgement... wink

And don't be tempted to go higher on the 2nd number unless you are towing with it a fair bit. Just means more VII's to shear and make a problem.

Do check it the rear is LSD and needs additive - that's an issue. If you do in fact have an LSD rear diff, then there's another level of additive and performance-check you need to do. So verify that and ask back.

The last time I did a bunch of differentials (2 years ago?), Walmart had a full syn Valvoline 75w-90 for like $7/qt, a real steal. No Idea if it is still around in their inventory.

Re: 85w90 vs 75w90 [Re: Rohan] #5289176 12/09/19 08:30 AM
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buck91 Offline
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So a few years ago I was doing regular drain and fills of a 2014 Explorer's PTU. FIlling involved squirting about 400ml of gear oil through a 16 inch long 3/8" diameter hose which I installed as a breather extension. The first time I used 80w90 that I had laying around as a short OCI "flush". This was in 90 degree August heat. It took FOREVER. Subsequent fills used quality 75w90 synthetic, which while still painfully slow were MUCH faster than the conventional.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: 85w90 vs 75w90 [Re: Oro_O] #5289295 12/09/19 10:40 AM
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dave1251 Offline
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Originally Posted by Oro_O


The last time I did a bunch of differentials (2 years ago?), Walmart had a full syn Valvoline 75w-90 for like $7/qt, a real steal. No Idea if it is still around in their inventory.



I paid close to this price for DELO 75W90 at AutoZone. I believe the value in is there.


make the inside of your engine oil cap white.
don't use.
Re: 85w90 vs 75w90 [Re: Rohan] #5290930 12/10/19 09:59 PM
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Rohan Offline OP
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Can someone verify if ml55 came with LSD? From googling online I don’t think ml came with lsd only GL Model.

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