I have no clue about the difference UDT or super UDT by the manual for my B7500 under Lubricants/transmission case lists only: "KUBOTA SUPER UDT fluid" and under the front axle case listed: KUBOTA SUPER UDT fluid or SAE80 / SAE90 gear oil but I guess the clue is SUPER UDT is the only oil listed for tranny case??