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#4610330 - 12/21/17 02:45 PM 75w90 vs 80
Kev994 Offline


Registered: 08/18/16
Posts: 19
Loc: North Carolina
I have always thought 75w90 was suitable where 80 weight gear oil was called for so Iíve been a bit confused as to why Amsoil doesnít recommend severe gear for my 2011 Outlander V6 AWD on their product recommender. I finally decided to ask what was up, here is the response I got from tech support :
Both the differential and transfer case call for SAE80, GL-5 gear lube. At this time we do not offer a GL-5 that is as light as SAE80

I was under the impression that Iíd take a minuscule mpg hit but that itís otherwise suitable, am I missing something?


Edited by Kev994 (12/21/17 02:47 PM)

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#4610377 - 12/21/17 03:48 PM Re: 75w90 vs 80 [Re: Kev994]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 472
Loc: Texas (south)
my car calls for a 75w80 in its tranny. I feel it is good enough.
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#4610393 - 12/21/17 04:06 PM Re: 75w90 vs 80 [Re: Kev994]
btanchors Offline


Registered: 04/10/04
Posts: 761
Loc: Herndon, VA
My Tundras and Tacoma specify a 75W-85 for the differentials, yet Amsoil recommends their 75W-90 for those applications.

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#4610497 - 12/21/17 06:17 PM Re: 75w90 vs 80 [Re: Kev994]
Kev994 Offline


Registered: 08/18/16
Posts: 19
Loc: North Carolina
I told the configurator that my car is a 2010 and it says all of the gear fluids are good, which is weird, itís the same car with the same fluid requirements.

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#4610576 - 12/21/17 07:38 PM Re: 75w90 vs 80 [Re: Kev994]
JLawrence08648 Offline


Registered: 01/20/17
Posts: 237
Loc: NJ
I use 75w90 but because of the thickness and especially in the cold weather, I use only synthetic.

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#4610602 - 12/21/17 07:58 PM Re: 75w90 vs 80 [Re: JLawrence08648]
Kev994 Offline


Registered: 08/18/16
Posts: 19
Loc: North Carolina
Originally Posted By: JLawrence08648
I use 75w90 but because of the thickness and especially in the cold weather, I use only synthetic.

Yeah, Iím moving back to Winnipeg so the 75w is what interests me, I noticed the Outlander is very sluggish to start with the 80 weight when itís below -30C

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#4610605 - 12/21/17 08:02 PM Re: 75w90 vs 80 [Re: btanchors]
Marco620 Offline


Registered: 02/25/14
Posts: 2188
Loc: Deplorable Kansan,HK fan!
Think Redline makes a 75/80 85 wt.
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#4610623 - 12/21/17 08:18 PM Re: 75w90 vs 80 [Re: Kev994]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
Originally Posted By: Kev994
I have always thought 75w90 was suitable where 80 weight gear oil was called for so Iíve been a bit confused as to why Amsoil ............

I'd similar thought as you.
75W90 would be fine, albeit with VII's.

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#4610690 - 12/21/17 09:46 PM Re: 75w90 vs 80 [Re: Kev994]
blupupher Offline


Registered: 08/27/04
Posts: 4426
Loc: Katy, Republic of Texas
Originally Posted By: Kev994
I have always thought 75w90 was suitable where 80 weight gear oil was called for ...


Same here, and is what I have in the rear of my bike (calls for SAE 80 Hypoid gear oil, am using some Supertech 75w-90).

Maybe since they have a lot more options the have different suggestions? It is harder to find a regular straight SAE 80.
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#4612661 - 12/24/17 02:32 AM Re: 75w90 vs 80 [Re: blupupher]
Kamele0N Offline


Registered: 02/09/15
Posts: 2046
Loc: Slovenia
Originally Posted By: blupupher
[quote=Kev994]

Maybe since they have a lot more options the have different suggestions? It is harder to find a regular straight SAE 80.


I think that these fancy grades (75w85, 75w80,75w,...) are here just to save the fuel...like your CAFE thing with xW20 oily water smile

So unless you live far up on the north...you can use regular 75w90 and 80w90 grades for a better protection...
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#4613310 - 12/24/17 06:26 PM Re: 75w90 vs 80 [Re: Kev994]
barkingspider Offline


Registered: 12/22/13
Posts: 2049
Loc: socal
My Colorado rear diff calls for 75w90 but i recently put 80w90 in it. So far, canít tell the difference. The coldest itís been here in SoCal is bout 44 F.
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