If you go to Kubota.com
Kubota UDT Trans Fluid
You will get the facts from the horses mouth.
There are now only two types - UDT (which is now actually
UDT2 oil as the original UDT is discontinued)) and Super UDT2
The following is extracted from their web site
____________________________________________________________________________
What is the difference between UDT and Super UDT2?
Both products are high quality lubricants. Super UDT2 delivers superior performance for water tolerance, smooth gear shifts, and reduced brake squawk. It does not thin out at high temperatures (no metal to metal contact), provides more power in hydraulic systems, improved transmission operation, and faster cold weather starts. Super UDT2 is the top performance lubricant designed to maximize the life of your Kubota.
What is the difference between UDT and Excavator Oil?
Operating conditions for excavators are quite extreme, temperatures vary widely, corrosion occurs and loss of hydraulic pressure is common. Kubota excavator lubricants are especially formulated to meet these requirements. There is a difference!
Is Super UDT2 a Synthetic Oil?
Super UDT2, Kubota's proprietary hydraulic/transmission fluid, is approximately 75% synthethic. It is a multi-purpose all-weather tractor hydraulic fluid. It is fully compatible with UDT fluids.
_______________________________________________________________________________________