Today's 110W Use to be Yesterday's 90W?

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I have seen several references saying today's 75W-110 was what used to be 75W-90. I want to read and study this. Where can I find how the viscosity standards changed making today 110W yesterday's 90W?
 
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Originally Posted by Gebo
I have seen several references saying today's 75W-110 was what used to be 75W-90. I want to read and study this. Where can I find how the viscosity standards changed making today 110W yesterday's 90W?
The only 75w110 I've seen is from Amsoil. Everything else I see is 75w90, 75w140, or 85w140.
 
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Thanks, Jeepman3071 but I'm trying to find the "article" that shows today's 110W used to be yesterday's 90W.
 
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all i could quickly find was THIS thread from 6 years ago, with a post from JHZR2, that started with "Remember that years ago, the API cut apart the "90" spec to be the lighter end of the original range."
 
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Originally Posted by Imp4
SAE J306 was revised in 2005. As part of that revision, the 110 grade was added between 90 and 140.
^^^this 75W-110 is the upper viscosity 75W-90 used to be before the revision. 75W-90 had a wider viscosity range versus what it has today. I use 75W-110 everywhere 75W-90 is specified
 
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Here's what I found. Like you can tell I ain't got a lot going on this evening. This is from a 2019 Lubrizol YouTube. 100 degrees 90w 13.5-18.5 110w 18.5-24 Do you know what the viscosities were in 2004? Are you saying in 2004 that 90W was 13.5-24?
 
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Originally Posted by Gebo
Here's what I found. Like you can tell I ain't got a lot going on this evening. This is from a 2019 Lubrizol YouTube. 100 degrees 90w 13.5-18.5 110w 18.5-24 Do you know what the viscosities were in 2004? Are you saying in 2004 that 90W was13.5-24 ?
Yes, you are absolutely right . And that is equivalent to a viscosity range from ISO 150 ([email protected]*C - 150 cSt) to ISO 320 ([email protected]*C - 320 cSt) viscosity grades, in gear-train lubricant terminology speak. Hence, IMHO, current modern day 75W90 grade is NOT equivalent to pre-2005 80W90 grade , let alone SAE 90 grade , from the perspective of gear lubricant applications . Never mind that I may be bashed.
 
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Ok, so if I wanna go with what was spec'd in my old stuff what is your opinion? 75W-110?
 
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Originally Posted by Gebo
Ok, so if I wanna go with what was spec'd in my old stuff what is your opinion? 75W-110?
Red Line 75W110 has a [email protected]*C of 131 cSt ISO 150 (being at lower or thinner end) gear lubricants would have a [email protected]*C range of 135 - 165 cSt. If your pre-2005 manual calls for 80W90, modern day RL 75W110 may be 'considered' as meeting specs, especially in this world of Bitog/CAFE/fuel efficiency etc . Numerically , that may be a different interpretation or judgement call . If your pre-2005 manual calls for SAE 90, personally I won't adopt 75W110 but hey, you make the call, not me . In order to be closer to the original intent of the OEM engineer who wrote the pre-2005 manual, modern day 75W140 may be a good compromise IMHO. Yes, a compromise.
 
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This is from my notes. And why Ford went from 80w-90 to 75w-140 in their requirements. Pre 2001 Specs @100C w90 13.5-24 w140 32.5-42 Post 2001 Specs @100C w90 13.5-18.5 w140 24.4-32.5
 
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Used 110 from 12K until now ~200K on my Highlander, the 80w90 and 110 were so close there was little reason to find 80w when most gear fluids back then were 75w90, unless one looked hard to find the 80w90. The viscosity of the 110 is a little thicker than the 80w90 but then Toyota wasn't specific on the viscosity other than GL5.
 
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Originally Posted by MaximaGuy
Used 110 from 12K until now ~200K on my Highlander, the 80w90 and 110 were so close there was little reason to find 80w when most gear fluids back then were 75w90, unless one looked hard to find the 80w90. The viscosity of the 110 is a little thicker than the 80w90 but then Toyota wasn't specific on the viscosity other than GL5.
Which 110 did you go with, if you don't mind saying?
 
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Used Amsoil for the first 100K (ran per the documentation 100K for normal use) and now on Redline although my preference is Amsoil.
 

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My research showed that modern 80-140 is the yesterdays straight 90 without the superb shear stability of the straight grade, and this is what I run in Lancruisers calling for the straight 90. In warmer climate I might consider LM 85-90 nas the closest substitute. 85-140 also works just fine, especially Delo ESI kompot.
 
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