Yes there are gears etc in the engine but the front diff gears would have more loads, stress, shear etc on them in my book. It might not be much but that is what we have gears fluids today and not UDT in the front axle of trucks, equipment ets. They make them for a reason.
Yes, Super UDT can be used in crankcase, gear application and hyd fluid since it is stated in the Super UDT spec as I was told. The normal UDT can not be used in the crank but all other apps yes. That is main delta on why there are two spec’s here, as I was told.
Again, per Kubota you can use either one since the properties of them are close. It is on the same line as hyd fluid and power steering fluid.
But based on my limited design experience I would select a gear fluid for any gear application, engine oil for crankcases/engines and an hyd fluid for hyd application. I would not try and switch fluids for certain areas since that is not design criteria. I can’t use UDT in my engine nor engine oil in my hyd system. They make fluids (different) for a reason.
The basestock will be similar but not the same and the adds will be different in gear fluids since there are design that way. Both parts play a huge role on how the fluid does within its life cycle. Almost the same thing as when people state all oils are the same, wrong.
In the end, you can use what the Kubota manual (guide) states. For those that have other reasons why you are doing other things, just make sure you do the homework first. Just make sure you see both sides of the answer before you do it.
And this is why I don't post much on oil threads on this forum any more. I could post facts till I am blue in the face and does in matter? no, people are going to do what they "feel" is right even if it does not compare to facts. Again, it goes back the old which oil is better. syn or dino. There is a difference but most do not choose to do it for reason not disclosed or the price is a concern.
So to answer this persons quesiton, why not ask all oil related questions to Kubota or the dealer? It seems eveyone will have opinions (good or bad) on this thread and no one knows which is correct or not. Go to the people that designed the unit. That is what I would do since in the end, it is your call as the owner. I usually do some home online and then go to work and as other engineers on what there opinions and why. If it has to do with gears, it is a completely new world. The designs are out of this world.
