Largely, a once true but long since outdated policy.
In years past, e.g., prior to post WWII redesigns, most automotive engines did not have oil filters. Rather they were designed to allow sediment (sludge) to collect on horizontal surfaces where it did little damage (up to a point). Such engines had oiling systems designed to tolerate a significant amount of sludge accumulated in the bottom of the oil pan and other horizontal surfaces. Most such engines had internal oil cleaners that were not serviceable without removing the oil pan, etc.
In the era, engine oils were so-called non-detergent. Without dispersants, such oils did not well keep sediment in suspension, rather allowing it to settle onto internal horizontal engine surfaces where it was of limited concern (up to a point).
Somewhat concurrently with the introduction of so-called detergent oils, engine oil filters became standard equipment on automotive engines. Full-flow oil filters were added to most automotive engines upon first post WWII redesign. The use of detergent oils served to keep sediment in suspension where it could be removed by the regularly serviced engine oil filter.
During the 50s and early 60s, there was a period of time when many older cars without engine oil filters and with much accumulated sediment within due to long term use of non-detergent oil were still on the road. The change to detergent oils in such engines without overhaul, including through cleaning of accumulated sludge, would cause once relatively harmless sediment to be circulated by the engine oil pump to wearing parts resulting in increased wear. Accordingly, the policy of not using detergent oils in old engines became a practice. Vestiges of such practice remain today but with little if any validity.
It is interstinig to note that, while most automotive engines did not have oil filters in the non-detergent oil era, many industrial engines, including many tractors, did, though service intervals varied widely.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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