I have done it both ways. I have two Farmall M tractors . One has 80w-90 in it and the other has Hytran in it . The one with hytran in it ,has had all the seals changed . Most original seals were of a leather nature and with hytran they will leak because the leather will not stay soft and plyable . The M with the Hytran has the newer seals rubber/neoprene . The Hytran has a additive that keeps seals plyable. I have pulled this M in tractor pulls and have plowed with it and never had any issues with it not being heavy enough, causing bearing failures . My suggestion to you is use 80w-90 or 85w-140 if your tractor has not had transmission and axles seals replaced. Both oils will work. I use hytran in all my hydraulic systems and transmissions even in my John Deeres" .The M with the hytran has had it in the tractor for at least 20 years . It is a daily user. Sorry for the long rant but this has been my experience . Use what is available and what you are comfortable with in this case.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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