What are the consequences of not changing engine oil?

[VonTeagan]

The effects of not changing engine oil for a long time: 1. Engine oil primarily serves to lubricate the engine. If not changed for an extended period, the oil can become ineffective and deteriorate, which will significantly increase engine wear. In severe cases, it may even lead to engine seizure. 2. Another critical function of engine oil is cleaning. If the oil is compromised, it cannot effectively remove impurities (such as carbon deposits and metal particles) that form on the working surfaces of engine components. Over time, this not only affects heat dissipation and lubrication but can also clog oil passages, leading to engine damage or even complete failure. Diesel engines may experience even harsher operating conditions. 3. The cooling efficiency of the oil will decline, negatively impacting various car components. Particularly vulnerable parts may sustain damage or even burn out over time.