There are many fluids that will work in the Sunstrand type U hydro unit that is used in our Cub Cadets. The same unit was used and still is used my most all major lawn and garden equipment mfgs and all of them have their own recommendations as to what fluid to use. The Sundstrand service manual even list's type F as a suitable fluid. I have drained hydros that have had hytran all of their life and also universal hyd fluid. There seems to be less sludge and gunk in the ones that had hytran. I just drained a Cyclops rear that to my knowledge still the the original hy tran in it and it is spotless inside. Tractor had 1100 hours on it. I also just drained the rear in the 1872 I am rebuilding and even though the fluid in is newer it was dirtier and there was more gunk in the bottom. I am a believer in the hytran. It is all we use in our IH and Case IH farm tractors. But as Jon said your money your machine.
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