We use 30wt mineral oil for aircraft engine break in. Usually the first 10-15 hours to help seat rings, and allow any impurities left in the engine to settle out. After the initial mineral oil of 10-15 hours, we drain and replace with an ashless dispersant. As the names imply, it has no ash, so there is no acid based constituents from the products of combustion(lots of blowby in aircraft engine), and dispersant which is the detergent part of the additive package.
Other than this corner case, I agree - use a modern detergent motor oil in any internal combustion engine.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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