Lack of engine oil can lead to a variety of symptoms, including high water temperature, engine noise, and敲缸声敲缸声, which can eventually result in engine damage such as曲轴曲轴瓦等机械部件的损坏. Without the proper amount of engine oil, the engine can quickly become non-functional.

Engine oil plays a crucial role in the engine by providing lubrication, cleaning, sealing, and cooling functions. When the engine is missing oil, it can cause a number of issues, including low oil pressure, leading to poor lubrication of engine surfaces, resulting in abnormal engine shaking and decreased power output. In severe cases, this can even lead to engine "burnout", which is characterized by engine malfunctions and eventually results in engine failure.

机油的缺失还会导致发动机内部各摩擦表面润滑不良，从而出现异常抖动，动力下降，严重情况下还可能会造成发动机“烧瓦”，发动机“烧瓦”即曲柄轴承与轴承座轴瓦应润滑不良出现烧蚀，其具体表现为发动机出现异常抖动，直至熄火，熄火后发动机将无法启动。

基础油是润滑油的主要成分，决定着润滑油的基本性质，添加剂可弥补和改善基础油性能方面的不足，赋予某些新的性能，是润滑油的重要组成部分。