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90W for Toyota and Lexus Rear Differentials? #5097215 05/06/19 08:14 AM
Joined: Sep 2002
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Gebo Offline OP
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In some of my owner's manuals (including my son's 2009 IS350) they call for 90W in the rear differentials. 75W90 in front and transfer cases.

I'm trying be true to the owner's manual and there has to be a reason they did not specify the 75W-90 for the rear. They do give the option
of using a 80W90 if it gets below 0F.

It seems "everybody" is using a 75W90.

Remember, this is BITOG and some of us have inquisitive minds and some don't.
And you can see in my sig I have been very successful in using Amsoil and Schaeffer gear lubes.
This is a question for knowledge.

There has to be a reason they choose 90W.


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

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097222 05/06/19 08:16 AM
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kr_bitog Offline
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Fuel economy..their new diff oil is lighter than 75w90, redline dave recommend RL 75w85 GL5

Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097240 05/06/19 08:34 AM
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JeffKeryk Offline
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Red Line 75W85 in our 2013 GS350.
75W90 is more common; I'm sure it works fine.

Last edited by JeffKeryk; 05/06/19 08:36 AM.

2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097242 05/06/19 08:36 AM
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crainholio Offline
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Just another data point: Amsoil Severe Gear 75W-110 in my 4Runner's rear diff and transfer case.

Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097249 05/06/19 08:48 AM
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Gebo Offline OP
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I think I made a mistake in my question. I may be getting "SAE" and "W" confused.


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

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097315 05/06/19 10:13 AM
Joined: May 2009
Posts: 14,620
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ARCOgraphite Online Content
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If your driving through a cold winter I would surely put a 80W- or 75W-90 in there. Unless its 1 ton dump truck or a clutch bangin' MT drag car with 300+HP You likely don't need the shock cushion of thick goo back there. The additives do the magic.


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: 90W for Toyota and Lexus Rear Differentials? [Re: crainholio] #5097414 05/06/19 12:19 PM
Joined: Dec 2017
Posts: 3,283
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JLTD Offline
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Originally Posted by crainholio
Just another data point: Amsoil Severe Gear 75W-110 in my 4Runner's rear diff and transfer case.


What year is your Runner?


Lates.
Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097419 05/06/19 12:22 PM
Joined: Sep 2007
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JMJNet Offline
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Lexus IS350 is a sedan.

Unless you are using it to tow, just get regular gear oil with 75W90 or similar viscosity.

Reason to go with thicker viscosity is towing.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: 90W for Toyota and Lexus Rear Differentials? [Re: JMJNet] #5097526 05/06/19 01:56 PM
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btanchors Offline
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Note that some of these sedans have differential capacities of barely over one quart.

My 2017 Lexus GS-350 calls for 75W-85; I use 75W-90.

Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097623 05/06/19 04:07 PM
Joined: Jan 2004
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nthach Offline
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I've always used 75W-90 in the Toyota diffs I've touched. Some of them call for Toyota Differential Oil LX if equipped with LSDs. Supposedly Red Line 75W-85 does work in those.

Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5097713 05/06/19 06:14 PM
Joined: Dec 2006
Posts: 641
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xtell Offline
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My Toyota Tacoma calls for 90 weight gear oil in the rear and 75w-90 in the front differential and transfer case. I've used 75w-90 in all three since changing out the factory fill. No issues with any of them. 90,000+ miles.

Re: 90W for Toyota and Lexus Rear Differentials? [Re: xtell] #5097719 05/06/19 06:22 PM
Joined: Sep 2010
Posts: 12,086
4WD Online Confused
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Some silly games from the OEM … GM rear calls for 75W85 and the front pumpkin 75W90 … do any grownups proof read these manuals (like I must do at work) …

Re: 90W for Toyota and Lexus Rear Differentials? [Re: JLTD] #5098074 05/07/19 06:48 AM
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crainholio Offline
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Originally Posted by JLTD
Originally Posted by crainholio
Just another data point: Amsoil Severe Gear 75W-110 in my 4Runner's rear diff and transfer case.


What year is your Runner?


2007 with 206K miles, driven in NJ all seasons...cold Winters, hot Summers. I use the same fluid in our '09 Subaru Forester front and rear diffs, 112K miles and no complaints. If the extra viscosity is costing me fuel economy, I can't tell.

Re: 90W for Toyota and Lexus Rear Differentials? [Re: Gebo] #5100380 05/09/19 08:55 AM
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zeng Offline
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90 grade gear oils used to refers to [email protected] range from 13.5 to 24.0 cSt, in gear oil speak is ranging from ISO 150 to ISO 320 gear oils.
SAE 90, being monograde, falls into ISO 220-320, whilst multigrade say, 80W90 falls into ISO 150 to ISO 220 gear oils.

Post 2005, the single 90 grade were divided into 2 categories. Namely current day SAE 90 AND uncommon SAE 110.

Hence in literal translation(?), a pre-2005 monograde SAE 90 should be directly equivalent to (uncommon) current SAE 110 whose [email protected]*V ranges from 220 cSt to 320 cSt.

Current day 75W90 is basically an ISO 100 gear oil with [email protected]*C of 100 cSt thereabout.

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