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They started adding detergents to the oil in the 50s. Almost all modern multi-weight oils are detergent oils. The detergent cleans the soot off internal engine parts and suspends the soot particles in the oil. They are too small to be trapped by the oil filter and are held in place until you drain your oil which makes the oil turn dark. They will not harm your engine but need to be removed periodically. If you do not change your oil they form sludge. All modern cars today require the use of a detergent oil. This detergent is a cleaning additive that helps prolong engine life. There are some applications that require the use of a non-detergent oil such as, compressors and some older small engines.

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14y ago

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