Mixing Multi G 134 and Hy-Tran Ultra

[agford4x4]

Hy-Tran is the Case fluid and Multi G 134 is the New Holland fluid. I have read here that they are NOT the same and cannot be used in place of the other or mixed. However, after contacting ViscosityOil, the very company that manufacture BOTH, the above is NOT true. Some have said Case says you cannot mix them, blah blah blah. However, ViscosityOil states that they are NOT the same, but they CAN be mixed or used interchangeably for topping off.

So, thats what i know. Anyone have any reason to dispute that?