I've understood for years that GL-5 gear oils may have additives that are damaging to copper alloys found in transmission synchromesh parts and in bushings and that GL-1, 2, 3 and 4 are safe for older machines that may have copper parts.
However, recently I've run across old tractor owners who claim that only GL-1 is safe to use and that in addition to GL-5, GL-2, 3, and 4 can also be corrosive to copper alloys.
Is this correct?
Thanks,
Bob
However, recently I've run across old tractor owners who claim that only GL-1 is safe to use and that in addition to GL-5, GL-2, 3, and 4 can also be corrosive to copper alloys.
Is this correct?
Thanks,
Bob