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As long as the label on the oil states MINERAL OIL or GL-1 it should be OK. The additives in GL-3-4-5-6 that make those oils perform well in hypoid gearsets under extreme conditions are reputed to damage brass (bronze?) parts over a period of time. The 'N piston-type hydraulic oil pumps (which are immersed in the gear oil) use brass (bronze?) parts, so the higher-numbered series of GL oils are NOT a good choice for these machines. Ford's modern specs for rear-end oil for these tractors is "M-134C, which is a much thinner oil than these tractors were shipped with originally. This oil is better for extreme cold weather operation, but is more likely to leak into the clutch housing or the brakes than the 90 weight oil, if your seals are less than perfect. Also, the 3-point lift system MAY not perform as well, or leak down quicker, or be more noisy with the lighter weight oil, if it is in less than perfect condition. If you do choose to go the route of the lighter oil, many "universal tractor fluids" or "universal hydraulic oils" meet the Ford specs. Check the label to be sure.
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