Hytran was developed by IH for the 06 series tractors with the hydraulic TAs it had special anti water properties not to absorb water. 303 was designed for the new generation john deeres with the wet brakes . during the 60s and 70s the rumor was that putting hytran in the deeres would ruin the brakes because of not having the wet brake additive and using 303 would make the IH TAs slip and fail. I believe the hytran has better cold weather flowing properties. we had IH so our dealer put hytran in everything that had hydraulic drivers it was in the bobcat and feed mixer two things that had to work in the Minnesota winters we never had any problems with thick oil. some of the neighbors did complain about the 303 being stiff in the winter. one last thing my dad lent his plow to his cousin it was an onland hitch with two hydraulic cylinders they pulled it with a JD 4840 and those two cylinders leaked oil after he used it for years but finally quit when the JD oil got flushed out.
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