I have a Farmall Super M - I just use Penzoil 30 W, but I live in Texas. I would assume that any good brand of oil would work. I also know never assume anything!
If memory serves me right the Farmall M is a gas motor. Rotella is really designed for diesel engines. Probably won't hurt it but I would just run a good 30 weight motor oil designed for gasoline engines.
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