75w-90 vs 80w-90

[logcar]

My 1996 S10 calls for 80w-90 diff fluid in the owners manual but it looks like there are limited options with that. So would there be any negatives to using 75w-90 in its place?

Thanks

 

[JMJNet]

No. It is actually a little better but it is negligible difference.

 

[simple_gifts]

Did that in my B2300. M1 was easier to find than a 80w-90.

 

[Jimzz]

75w90 will work better and most is synthetic or at least semi-syn.

 

[aquariuscsm]

80W90 Amsoil AGL.

 

[umungus1122]

Autozone has several 75w/80w-90 conventional, blend, and Castrol syn gear oils for $5qt. each if you order online and pick up in store right now.

 

[Hootbro]

How is finding 80W-90 "limited options"? Unless you live on the moon, any Wal-Mart, AutoZone or parts house is gonna have that.

 

[Sam_Julier]

Originally Posted By: logcar
My 1996 S10 calls for 80w-90 diff fluid in the owners manual but it looks like there are limited options with that. So would there be any negatives to using 75w-90 in its place?

Thanks


See response from cnewton3 in this thread. I run the least expensive 80W90 or 75W90 GL-5 that meets the SAE J-2360 spec in the Volvo 240 differentials.

https://bobistheoilguy.com/forums/ubbthr...Per#Post4377471

Sam

 

[BrianF]

Go to the store, which ever one is easier to find and cheaper.

 

[jj51702]

Walmart has supertech 80w-90 in individual quarts and some even have a gallon container of the same for a great price

They also carry supertech 75w-90 syn blend

 

[zeng]

Originally Posted By: logcar
My 1996 S10 calls for 80w-90 diff fluid in the owners manual but it looks like there are limited options with that. So would there be any negatives to using 75w-90 in its place?

Thanks

1996 era classification of 80W90 had been split into 2 sub categories, namely:
a )xW110 , and
b )xW90 .
I'm of the opinion that a 75W90 is not quite appropriate for differential components protection.
My vote goes to (higher KV@40*C) current generation 75W110 > SAE 90 > SAE 80W90.

 

[Sam_Julier]

Originally Posted By: zeng
Originally Posted By: logcar
My 1996 S10 calls for 80w-90 diff fluid in the owners manual but it looks like there are limited options with that. So would there be any negatives to using 75w-90 in its place?

Thanks

1996 era classification of 80W90 had been split into 2 sub categories, namely:
a )xW110 , and
b )xW90 .
I'm of the opinion that a 75W90 is not quite appropriate for differential components protection.
My vote goes to (higher KV@40*C) current generation 75W110 > SAE 90 > SAE 80W90.


I'm unclear about this comment. Are there tests showing 75W90 meeting SAE J-2360 offers less protection than 80W90 meeting the same spec? Thanks. Sam

 

[Y_K]

Originally Posted By: Sam_Julier
I'm unclear about this comment. Are there tests showing 75W90 meeting SAE J-2360 offers less protection than 80W90 meeting the same spec? Thanks. Sam


90 of 1996 was thicker than 90 of 2017. As for protection, if the film strength of today is proportionally better, then it may not matter. At least, that is what Chevron Delo ESI series gear oils try to accomplish.