I've been using Hytran in my 300 Utility since i purchased it and changed all the fluids and repairs almost 5 years ago. I've added about 8 gallons over that period and am coming to the end of a 5 gallon bucket. A leak from the hydraulic pump has gotten worse over time and I'll be reparing that in the spring but I'm not going to make it through plowing this winter without needing more then I have left. In the meantime is there any harm mixing the tractor supply premium fluid in with the hytran. I used that stuff briefly in my 350 before i began repairs on the power steering. My nearest case