I spent a lot of time last season researching all our fluid needs, when it came to the hydraulic oil I went with the Schaeffer 315 Simplex Supreme I based this on the fact that the one fluid would cover most of our needs. We use it in a Kubota to replace the "super udt" fluid. The machine has 4700 hours. That fluid is about 10bux less a gallon than the Kubota and the Schaeffer company tells you everything about the fluid, no other company has as detailed a PDS as they do. In my opinion this is the best alternative for Super UDT for my needs. I have a VOA of the fluid being done now to compare to our previous fluid, to help me justify the cost. I should have the results soon. If permissible I will post .