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 - A Towny Goes Plowing - by Anthony West (UK). I live in an area renowned for its rural beauty. Small fields with hedgerows and trees are common place, as are small hamlets with village greens and the odd duck pond complete with swans. The center of any village once the shop is closed is the old tavern. Rustic places with cheerful names like "The Griffin" "Red Lion" or "The Plough and Harrow" are found dotted around the country lanes all over the place. The warm glow of yellowish light can be seen for quite some distance at dusk, and
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