Continuing what everyone else wrote, the big deal with detergent/non-detergent oil is the sludge. Non-detergent oil does not keep the engine carbon in suspension, so it settles out like shoe polish at the bottom of the oil pan. Detergent oil does not allow the carbon (basically graphite) to settle out. So, there is some risk that if you have a lot of carbon sludge, then it could get mixed into the oil if you suddenly put non-detergent oil in there. I am not sure how big of a deal this is, but if you detect sludge like Janicholson described, I would drop the oil pan and scrape it out clean, do an engine flush with diesel fuel, a filter change, and then run only modern detergent oil from then on. I did this on my IH "A," and discovered probably 2-3 inches of muck, along with a well-preserved bumblebee from half a century ago, etc. Your tractors are probably due for it, and would thank you if they could talk.
The old engines originally used single-weight non-detergent oil since it was the only oil available. Now it is time for modern oil, modern anti-freeze, modern grease, etc. Some hydraulic systems, gas turbines, and other systems still use non-detergent, but those are very different applications.
The oil labelled "lubricating oil" you describe is probably non-detergent oil. I've attached a link to some options. You could use the "lubricating oil," but it will cost you more, both in terms of $$ and wear on the engine from reduced effectiveness. Good luck. Dave
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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