It would have originally had straight 30 weight in the engine, 20, or 10 in extreme cold climates.
The transmission, differential (all a common oil fill) was 90 weight GL1 mineral oil. Not hypoid or EP lube.
You can still get 90w mineral oil, but it will slow the hydraulics down in cold weather. To simplify everything , what most do is run 15w 40 diesel oil in everything.
The steering gear also used 90 weight oil, but few will hold it due to leaky seals. A common substitute is to pump in grade 0 or 00 grease, aka "corn head" grease. It is thin enough to not channel away from gears, but thick enough to stay in with less than perfect seals.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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