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What is the cause the engine oil become dirty and changing colours?
Wiki User
∙ 11y ago
Oil contains detergents that clean your engine and suspend soot, deposits, & dirt in the oil. The air and oil filters remove most of the larger particles but some get in the engine and stay suspended in the oil which causes it to turn black. Oil is not only a lubricant and helps cool the engine, but it also keeps the engine clean.
Wiki User
∙ 11y ago
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