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Valvoline 75W-90 vs. 80W-90 - Nissan Xterra/Frontier #5291566 12/11/19 01:26 PM
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Spddm0n Offline
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I've been challenged recently with Valvoline's decision to remove LSD additive from their 80W-90 gear oil (GL5) that I used in my rear differential. I really want to keep costs down and even adding the additives to each axle will be costly.

I noticed the kinematic viscosity of the 75W-90 (does still have the LSD additive in it) is actually higher at 100 degC than the 80W-90 (15.47 vs. 14.5), and the 40 degC viscosity is much lower than the the 80W-90 (expected), at 99.0 vs. 145.9).

I'm wondering how the lower viscosity of the 75W-90 at lower temperatures could affect the rear differential operation. Would it be safe to use? Nissan "calls" for a 80W-90 in both front and rear differentials.

Anybody know what the kinematic viscosity is for the OEM Nissan fluid (80W-90)?

Thanks!

Re: Valvoline 75W-90 vs. 80W-90 - Nissan Xterra/Frontier [Re: Spddm0n] #5291602 12/11/19 02:18 PM
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Astro14 Offline
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The thinner viscosity of the 75W90 at lower temperature still gives you an oil hundreds of times thicker than any of them at operating temperature.

So, no, I wouldn’t worry a bit about using it.


32 Packard 15W40
01 Volvo V70 T5 0W30 AMSOIL SS
02 Volvo V70 T5 0W30 Edge
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Pennzoil Ultra
Re: Valvoline 75W-90 vs. 80W-90 - Nissan Xterra/Frontier [Re: Spddm0n] #5291783 12/11/19 06:48 PM
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Anthony Offline
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100% safe to use.


95 Nissan Hardbody V6 - M1 HM 5w30
13 Nissan Titan - Pennzoil Platinum 5w30
17 Ford Mustang GT - Pennzoil Platinum 5w30
Re: Valvoline 75W-90 vs. 80W-90 - Nissan Xterra/Frontier [Re: Astro14] #5293351 12/13/19 10:39 AM
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Spddm0n Offline
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Originally Posted by Astro14
The thinner viscosity of the 75W90 at lower temperature still gives you an oil hundreds of times thicker than any of them at operating temperature.

So, no, I wouldn’t worry a bit about using it.

Thanks for the reply. I figured in most cases there wouldn't be any issue, but I wonder if there is a need to better protect the gears when cold out and instantly starting off in the vehicle in 4WD. I wonder if the reduced viscosity in the cold weather may not support the possible shock loading?

Anyone use 75w-85 instead of 75w-90 #5293872 12/13/19 09:42 PM
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jqgz Offline
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The Kv 100 isn't that far off but the KV 40 is a lot lower. I would think this would help gas mileage and responsiveness but am concerned about wear. Anyone have experience to share? I have a 2015 Subaru.

Re: Anyone use 75w-85 instead of 75w-90 [Re: jqgz] #5293883 12/13/19 09:59 PM
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BlakeB Offline
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I’m using 75w90 on Toyota’s specifying 75w85. No issues, so far. I don’t think you’d have any issues with 75w85 in place of 75w90. They did a study one time and I believe they said using a 75w90 in place of 80w90 resulted in about a 1% efficiency gain. I don’t think the gains you’d see using a 75w85 in place of 75w90 would be significant or measurable on a small scale.

Re: Anyone use 75w-85 instead of 75w-90 [Re: jqgz] #5293900 12/13/19 10:33 PM
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Impatient Offline
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What KV40 specs have you seen? I’m grappling with gear oil decision myself, and think there is a wide range of specs within the 75w90 offerings. For instance, Motul 300 has KV40 of 72.6, whereas Delvac has 120, and I’m not sure this is the highest (Amsoil Longlife has 129). I found a Chevron 75w85 with 72, so that KV40 is v. close to the Motul 300, while the KV100 is much lower (as you might expect). Meanwhile Motylgear (semi-syn?) 75w85 has 82 KV40. Also, compare Amsoil SeverGear to their LongLife, and you’ll see overlap/inconsistency on the KV40/KV100 specs.

By the way, some of this depends on which Subaru, which transmission, which transaxle. You may need to be careful if you have certain manual transmission. There’s the whole friction modifier/no friction modifier discussion. 2007 Subaru with Torsen rear specs 75w90, without friction modifiers. I didn’t know how “thin” the Motul 300 was at 40c when I put it in my rear diff, but seems reasonably OK. It’s possible a higher KV40 would work better. Motul 300 has a very “extreme” VII...so maybe it’s a good 75w85 surrogate.

Last edited by Impatient; 12/13/19 10:39 PM.

15 Ford Transit 250 3.5EB Turbo
07 Subaru OBXT 2.5 Turbo Castrol Euro 0w30
Re: Anyone use 75w-85 instead of 75w-90 [Re: jqgz] #5294007 12/14/19 06:27 AM
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Railrust Offline
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I used 75w90 in place of 75w85 in my Lexus for five years (over 100,000 miles of driving) without one single issue or drop in fuel economy. And I'm doing it now again in my 2018 Silverado (40,000 miles), with once again no difference in performance or fuel economy. So I would think switching from 75w90 to 75w85 wouldn't be a problem...question is, why would you want to?


2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
2008 Honda CRV
(Whatever synthetic oil is on sale or rebate)
Re: Anyone use 75w-85 instead of 75w-90 [Re: jqgz] #5294114 12/14/19 09:10 AM
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dippschtick Offline
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I'm running Ravenol 75w85 in my 4Runner but since it came with 75w85 I have nothing to compare.

I have had zero issues with the Ravenol though.

That being said, I'll probably go with a 75w90 on the next change.

Re: Anyone use 75w-85 instead of 75w-90 [Re: jqgz] #5294260 12/14/19 11:59 AM
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Gebo Offline
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Originally Posted by jqgz
The Kv 100 isn't that far off but the KV 40 is a lot lower. I would think this would help gas mileage and responsiveness but am concerned about wear. Anyone have experience to share? I have a 2015 Subaru.


I think you will be amazed at how the viscosities among the 75W-90's vary among different brands of gear oils. Mobil, Amsoil, Valvoline, Schaeffer, Lucas, RL all have differing viscosities even though they are all 75W-90's.


'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: Valvoline 75W-90 vs. 80W-90 - Nissan Xterra/Frontier [Re: Spddm0n] #5294264 12/14/19 12:03 PM
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When I worked at the local Nissan dealer, If a customer wanted synthetic fluid in the diff, I would get 75w90 Valvoline synthetic from the parts store up the street. Always worked well, never any issues.
As a side note, the rear diffs on many of the Nissan trucks had a little metal vent that had a tendancy to clog up with mud, rust or road debris.
Might want to check and replace if needed. A clogged vent will allow pressure to build and cause seal leaks.


2008 Ford F350
2008 Kia Spectra
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor
Amsoil lubes and filters!
Re: Valvoline 75W-90 vs. 80W-90 - Nissan Xterra/Frontier [Re: BlakeB] #5297520 12/18/19 02:59 AM
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BlakeB Offline
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Originally Posted by BlakeB
I’m using 75w90 on Toyota’s specifying 75w85. No issues, so far. I don’t think you’d have any issues with 75w85 in place of 75w90. They did a study one time and I believe they said using a 75w90 in place of 80w90 resulted in about a 1% efficiency gain. I don’t think the gains you’d see using a 75w85 in place of 75w90 would be significant or measurable on a small scale.

https://apps.dtic.mil/dtic/tr/fulltext/u2/1039630.pdf

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