What kind of engine oil should be used for a 15-year-old car?

[DelLaura]

For a 15-year-old car, the engine components are severely worn, and the gaps are relatively large. It is recommended to use engine oil with a higher viscosity grade, which can form a thicker oil film between the gaps of various components. 10W-50 engine oil is recommended. Information about engine oil: 1. Composition of engine oil: Engine oil consists of base oil and additives. Base oil is the main component of lubricating oil, determining the basic properties of the lubricating oil. Additives can compensate for and improve the shortcomings of the base oil's performance and provide certain new properties, making them an important part of lubricating oil. 2. Classification of engine oil by viscosity: 10W-40 is its SAE standard viscosity value. This viscosity value first indicates that this oil is multi-grade oil. W stands for WINTER, and the number before W represents the flow performance at low temperatures. The smaller the number, the better the starting performance at low temperatures. The number after W represents the stability of the oil at high temperatures (i.e., the possibility of thinning). The larger the number, the better the stability of the oil at high temperatures.