Understanding ATF technical data

[Charmet37]

Need help understanding ATF viscosity numbers, Having a transmission fluid with a higher flash point and lower pour point better for transmissions or does it really matter? A fluid with a viscosity of 100 Cst@ 7.2 and 40 Cst@ 33.0 -flash point @190 - pour point @ -51 Vs 100 Cst@ 6.8 - 40 Cst@ 29.7 -flash point @ 208, Pour point @ -45, Thanks.

 

[benjamming]

This thread, Three ATF's Analyzed, might be helpful for ATF suitability. Pour & flash points may not be of first order importance.

 

[Charmet37]

This thread, Three ATF's Analyzed, might be helpful for ATF suitability. Pour & flash points may not be of first order importance.

Thanks

 

[MolaKule]

Need help understanding ATF viscosity numbers, Having a transmission fluid with a higher flash point and lower pour point better for transmissions or does it really matter? A fluid with a viscosity of 100 Cst@ 7.2 and 40 Cst@ 33.0 -flash point @190 - pour point @ -51 Vs 100 Cst@ 6.8 - 40 Cst@ 29.7 -flash point @ 208, Pour point @ -45, Thanks.

A step-shift ATF fluid with a viscosity of 7.2 cSt@100C and 35 Cst@40C is generally called a Dex/Merc fluid attributed to GM's Dexron II and III.

A step-shift ATF fluid with a viscosity of 6.3 cst@100C is called an LV fluid, first attributed to GM's Dexron VI.

A step-shift ATF fluid with a viscosity of 4.5 cst@100C is called a ULV fluid, generally used in the newer Multi-gear (7-10) transmissions.

The second most important ATF spec is the Brookfield viscosity for the low temperature fluid behavior.

Google:

Instrumental Approach and Improvement of the Low-Temperature Determination of ATF Fluidity Author: Theodore Selby; Savant, Inc. Presented at the 63rd Annual STLE Meeting & Exhibition Cleveland, Ohio, May 18-23, 2008

 

[Egg_Head]

I Googled Theodore Selby, what a life story this man had and a giant in the lubrication industry.

https://www.savantgroup.com/events/...s-best-passing-theodore-w-selby-savant-group/

 

[Charmet37]

Got it, I now have a understanding of what the viscosity numbers mean