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75w85 VS 75w90 #5086820 04/26/19 08:21 AM
Joined: Aug 2003
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nicholas Offline OP
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Hey Everyone,

Our 2019 Santa Fe specs 75w-85 in the transfer case and rear diff.
In the past I have used 75w-90.

I was wondering if you all think the 90 weight would be better for longevity VS .005 mileage increase for the 85.

Thanks


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: 75w85 VS 75w90 [Re: nicholas] #5086830 04/26/19 08:30 AM
Joined: Feb 2009
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krismoriah72 Offline
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Super Tech 75W90 Full Synthetic $5.86/qt API GL-5 and MT-1, SAE J2360

Ive never seen proof of 'longevity'.. but those specs and price are impossible to beat.

Re: 75w85 VS 75w90 [Re: nicholas] #5086868 04/26/19 09:07 AM
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ARCOgraphite Offline
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I would assume the 85 is more shear stable performance for the X-fer case. I would imagine its same as 90 but with less VM. Depends on the below freezing performance - maybe the 75W85 flow MUCH better.. My Nissan hated the dealer installed HD 80W90 MOBIL
Just Valvoline or Pennzoil or Castrol or Supertech 75w90 in the rear would be fine.

I put supertech 75W90 in the wife's Crosstrek with a noisy rear and .... its not noisy now! I though the dealer didn't change it when last requested, but the fluid looked
new and no metal fuzz on the drain plug magnet.
Maybe just a fluke.

Last edited by ARCOgraphite; 04/26/19 09:09 AM.

2019 VW Jetta S 6MT OCI#1 5885mi-Castrol Edge Prof? VW508+VW Service Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: 75w85 VS 75w90 [Re: nicholas] #5086991 04/26/19 10:58 AM
Joined: Mar 2012
Posts: 8,168
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edyvw Offline
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Originally Posted by nicholas
Hey Everyone,

Our 2019 Santa Fe specs 75w-85 in the transfer case and rear diff.
In the past I have used 75w-90.

I was wondering if you all think the 90 weight would be better for longevity VS .005 mileage increase for the 85.

Thanks

I have same dilemma. I wanna use Redline, but Redline offers 75W85 for TC and differentials, while Toyota wants 75W90.


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: 75w85 VS 75w90 [Re: nicholas] #5087078 04/26/19 11:57 AM
Joined: Oct 2014
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Jimzz Offline
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Most 75w85 seems to be conventional while most 75w90 is synthetic now.

I would run the 75w90 myself.


yup
Re: 75w85 VS 75w90 [Re: nicholas] #5087152 04/26/19 12:44 PM
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nicholas Offline OP
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I am looking at Redline for both 85 and 90 weights.

What do you y'all think?


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: 75w85 VS 75w90 [Re: Jimzz] #5087171 04/26/19 12:58 PM
Joined: Mar 2012
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edyvw Offline
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Originally Posted by Jimzz
Most 75w85 seems to be conventional while most 75w90 is synthetic now.

I would run the 75w90 myself.

Redline 75W85 is full synthetic.


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: 75w85 VS 75w90 [Re: nicholas] #5087628 04/26/19 08:17 PM
Joined: Sep 2015
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zeng Offline
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Joined: Sep 2015
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Originally Posted by nicholas
I am looking at Redline for both 85 and 90 weights.

What do you y'all think?

I would pick RL 90 then.

Re: 75w85 VS 75w90 [Re: Jimzz] #5104153 05/13/19 11:26 AM
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Hootbro Offline
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Posts: 2,720
Originally Posted by Jimzz
Most 75w85 seems to be conventional while most 75w90 is synthetic now.

I would run the 75w90 myself.


Are you sure 75W-85 can be had in a conventional? My understanding of the recommendation of 75W-85 was to actually force people into a synthetic gear lube because there is still some conventional spec's 75W-90 out there.

That being said, I have used a synthetic 75W-90 in place of the 75W-85 gear oil call outs in all my Toyota's with no issue.


2020 Jeep Gladiator Rubicon 3.6L (Dealer Bulk 0W-20)
2017 Jeep Renegade Latitude 2.4L (Idemitsu 0W-20)

Re: 75w85 VS 75w90 [Re: nicholas] #5104170 05/13/19 11:47 AM
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Posts: 8,148
dnewton3 Offline
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I SERIOUSLY doubt any ring/pinion or t-case will ever know the difference between 85 vs 90 grade.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: 75w85 VS 75w90 [Re: nicholas] #5104187 05/13/19 12:02 PM
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ad244 Offline
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Where's the 110 Crowd?

Re: 75w85 VS 75w90 [Re: ad244] #5104456 05/13/19 04:52 PM
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MolaKule Offline
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Originally Posted by ad244
Where's the 110 Crowd?


Nice SUV vehicle.

Why use a SAE 110 if it doesn't need it?

With the 2.XL engines you develop an average of 180+ Lb.ft of torque.

I am not downplaying this vehicle by any means but this is not exactly a Cummins axle-torque-twisting engine.

I would say the Redline https://www.redlineoil.com/Content/files/tech/75W85_GO_PROD_INFO.pdf gear oil would work just fine.


"You ... sadist," said Mr Cummings, "you try to make people think." Ezra Pound (1885-1972)
Re: 75w85 VS 75w90 [Re: nicholas] #5104532 05/13/19 06:37 PM
Joined: Aug 2018
Posts: 734
RDY4WAR Online Content
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I use Amsoil Severe Gear 75w-110 in my Tahoe. I switched to it from 75w-90, before I joined here, because I figured it would help with the towing I do. I tow a 6,000 lbs load about 200 miles round trip twice a month. I'm not sure if it helps or not.


"He who is without oil, shall throw the first rod." - Compressions 9:1
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