Though owner's manuals don't specify non-detergent oils, a friend is a strong believer that non-detergent oil should be used in engines without an oil filter; typical lawn mower engines. His rationale is that detergent oils keeps dirt and wear metals suspended in the oil that will circulate, and non-detergent oils will keep those item at the bottom of the engine.
Does anyone use non-detergent oil, have the same belief, and have had engines outlast someone using detergent oil?
Does anyone use non-detergent oil, have the same belief, and have had engines outlast someone using detergent oil?