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 - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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