Why Does Engine Oil Turn Black After Some Time of Use

[VanMia]

Engine oil has a cleaning function. As it continuously circulates within the engine, it cleans sludge and carbon deposits inside the engine, which is why the oil turns black after some time of use. This is a normal phenomenon. If the cleaning ability of the oil is poor, it may not turn black even after prolonged use. Below is some extended information about engine oil: 1. Engine oil is often referred to as the 'blood' of the engine. Without oil, the engine cannot operate properly. When the engine is running, the oil forms a thin film on the surfaces of various components inside the engine, preventing direct contact and friction between them. 2. In the engine, oil not only lubricates but also serves functions such as sealing, cushioning, rust prevention, heat dissipation, and cleaning. 3. Over time, engine oil becomes dirty and its performance degrades, necessitating replacement. Prolonged use of old oil can accelerate engine wear. When changing the oil, it is also advisable to replace the oil filter, which is responsible for filtering the oil.