It seems like engines started using detergent oils when they started using full flow oil filters. The detergent keeps the crud in suspension and caries it to the filter.
Some engines without oil filters have sludge traps, basically centrifgal oil seperators that would spin the oil and collect the crud. Otherwise it would just settle in the pan or the oil tank.
There is no point in detergent oil if there is no filter.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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