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Let me shed a little light on the subject of Detergent vs Non-Detergent oil. In high school automotive class we had the discussion on detergent vs non-detergent oil. Most people think of a detergent as a solvent. not completely true. As it pertains to oil. Detergent oil has the ability to hold particles in suspension. Non-Detergent will allow those particles to settle to the bottom of the pan. It is important to use a detergent oil with a pressureized system with an oil filter. The detergent holds the particles in suspension till the filter removes them, then the clean oil is pumped to the parts needing lubrication. Now it as important to use a Non-Detergent oil in a non-pressureized system with no oil filter so that the particles (dirt, metal chips) will settle so that the oil remains contaminate free as the system has no way to remove the particles until you flush the system. Detergent oil has very little solvent ability and will NOT loosen up sludge and other contaminates within the system. Kerosene, mineral spirits and parts solvents have that job. So we decided after a good debate and a lot of rethinking, as a good rule of thumb.... Oil filter = Detergent oil No oil filter = Non Detergent oil I hope this is helpful to a few of you>
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