Transmission Fluids
Background & Properties
castrol.com/GPS
800 255 4417
May 2025
GPS
Important Transmission Fluid Properties
Reviewing the different friction characteristics of transmission fluids makes it clear how the incorrect fluid
choice could be a serious detriment to equipment and its operation. Proper transmission fluids are a wise
investment that provide return in the long run.
TRANSMISSION FLUIDS: A CHARACTERISTIC COMPARISON
FLUID FEATURES TO-4 FLUID THF Dexron III HD/
TES-389
Friction Grabby Most
Slippery
Slippery
EP/AW Very Good Best Good
Oxidation Good Good Best
Low Temperature Poor Good Best
Water Sensitivity Wet Anti-foam Test Very Good Not Tested
Color Dyed (some) ___ Dyed
Viscosity Grade Kv at 100
degrees C
Various (6-26) 10W-30
(9.5-10.5)
0W-20
(7.0-7.5)
D5
I I
ecastrof
