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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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