At what color should engine oil be replaced?

1 Answers
McJulia
07/30/25 4:47am
Engine oil should be replaced when it turns black. New engine oil is light yellow and transparent. After being added to the engine, due to prolonged use, some carbon deposits inside the engine cause the oil to become slightly black. Over time, it will turn completely black. Engine oil, also known as engine lubricant, serves multiple functions such as lubrication, reducing friction, aiding in cooling, sealing against leaks, preventing rust and corrosion, and cushioning shocks. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of the lubricant, determining its basic properties, while additives compensate for and improve any deficiencies in the base oil's performance, providing additional beneficial properties. Additives are an essential part of engine oil.
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