Quote:
Originally Posted by J-Mech
...... it's gear lube.... 
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My exact thought!
I hope it wasn't expensive!
I'm sure in 50 years it will become a collectors item (honestly... us tractor guys are insane) so don't open it!!
Put some Mobil 1 in it instead... Same GL-5 rating, probably will never be collectable, and all of the benefits of synthetic (virtually no ash)....