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 - Show Coverage: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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