What effects can counterfeit engine oil have on a car?

[OFelix]

Using counterfeit or low-quality engine oil can lead to increased engine noise, which becomes louder as the speed increases, and the car may feel underpowered; it can cause cylinder scuffing; and it can accelerate wear on various bearings and moving parts of the engine, significantly reducing the engine's service life. Specific details are as follows: 1. Increased noise: Using counterfeit or low-quality engine oil can result in louder engine noise, which becomes more pronounced at higher speeds, and the car may feel sluggish. 2. Cylinder scuffing: Cylinder scuffing occurs because counterfeit oil fails to meet standards for high-temperature resistance, viscosity, and other indicators, making it difficult to form an oil film between the cylinder walls and pistons, leading to poor lubrication and severe engine damage. 3. Substandard lubrication: The use of counterfeit oil results in inadequate lubrication, causing accelerated wear on various bearings and moving parts of the engine, thereby greatly reducing the engine's service life.