Ford/Ferguson recomended 90W GL-1, so-called "straight mineral oil" in the transmission/hydraulic/differential sump of the 9N tractor when it was designed in the 1930s due to the brass/bronze parts in the hydraulic pump.
Both Ford and MF continued to recommend 90W GL-1 oil in the sump of 9/2/8Ns and similar MF models with the pump in the sump for many years thereafter but no longer do.
GL-1 90W (mineral oil) is still available but few stores stock it these days and I doubt if it is available in quarts.
Oils have improved enormously since the 1930s. I use the CNH pourable, high EP oil in steering boxes and rotary cutter gearboxes that are prone to leak but any good GL-5 90W, 85W90, 85W140, etc., will be fine in your steering box.
If you insist on GL-1, buy a 5 gallon pail and you will have enough for your self and all of your friends and neighbors for the rest of your lives.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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