Not that your "A" would probably ever know the difference.
As time and oils have progressed, GL5 (which is good for heavily loaded gears) (think high HP modern tractors) has additives that can be corrosive to "yellow metal" parts (brass or bronze thrust washers) used in the transmissions and differentials of certain older machines. (Some brands of GL5 are advertised as "yellow metal safe".)
Good 'ol GL1 is likely "better" than what your tractor left the factory with, and at 20-some HP it certainly doesn't need GL5.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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