According to this fellow linked below, GL-5 oil is buffered sulfur-phosphate and doesn't corrode yellow metals, however, it does pose a problem with synchronizers in transmissions. As far as I know, an old JD40 does not have synchronizers; it is a straight trains. GL-4 is nearly impossible to find for a reasonable price (by this I mean it can be purchased as a house brand in a large quantity) where I live, by GL-5 is in abundance, but as 80w-90 and 85w-140.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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