Bring it to any oil supply place and they will tell you what to use. It looks like universal tractor transmission and hydraulic fluid that meets Cat T02(T04 now) and allison C-4 specs. Lots of those available. looks like GL-4. Not sure of viscosity, . It is in the spec but I dont know how to do the conversion to a W number.
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/ I need to find the equivalent of EXXON Torque Fluid 56
In the USA it is Mobilfluid 424 but you can see from the link that it meets many makers proprietary numbers and "equivalents" are available at huge discounts depending on how much risk you are willing to take.
/ I need to find the equivalent of EXXON Torque Fluid 56