The M transmission contains only straight cut spur gears and single straight cut bevel set (differential drive gears). Consequently a GL1 rated lubricant is entirely adequate.
GL2 is OK too - it's essentially GL1 with some added rust/oxidation inhibitor.
GL3 and higher rated oils contain EP (extreme pressure) additives. These are intended for highly-loaded hypoid and spiral bevel gearing. These additives are unnecessary and may be actually harmful to the "stone age" transmission in an old tractor. (Some EP additives cause INCREASED friction and wear in low tooth pressure-loaded spur gearing such as is in your M)
Bottom line: Buy the cheap GL1. It's a far better lubricant than the best that was available back when your M gearing was designed!!
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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