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 Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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