Got a reply back from Kubota on the SUDT2. This is what they said:
UDT, Super UDT and Superr UDT II are fully compatable in any %.
Super UDT II is a synthetic blend.
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LOL--peope said the same thing about SUDT too! But, what get me, is I am paying what for a blend (grp #3 fluid)..Heck, Amsoil is the saem price for a group 4...
You would think Kubota would just come out with a group 4 & be done with it.