What kind of engine oil is generally used for small cars?

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Small cars generally use fully synthetic engine oil. Main characteristics of engine oil: Engine oils on the market can be simply divided into two types based on their base oil: mineral oil and synthetic oil (vegetable oil is not considered due to its scarce production). Synthetic oils are further divided into: fully synthetic and semi-synthetic. Lubricant base oils are mainly categorized into mineral base oils and synthetic base oils. Mineral base oils are widely used and consumed in large quantities, but some applications require products blended with synthetic base oils. Engine oil classification standards: 10W-40 is its SAE standard viscosity value. This viscosity value first indicates that the oil is a multi-grade oil. W stands for WINTER, and the number before W represents the oil's flow performance at low temperatures; the smaller the number, the better the starting performance at low temperatures. The number after W represents the oil's stability at high temperatures (i.e., the likelihood of thinning); the larger the number, the better the oil's stability at high temperatures.