Can 15w40 engine oil be used in sedans?

1 Answers
AddysonMarie
07/29/25 11:35pm
15W40 and 20W50 are two different grades of engine oil, but both belong to multi-grade oils. The "W" stands for Winter, the number before "W" represents low-temperature fluidity, and the number after "W" represents high-temperature viscosity. Thus, the difference between 15W40 and 20W50 lies in their low-temperature fluidity and high-temperature viscosity. For sedans, 15W40 engine oil can be used, but it is more suitable for summer conditions. Relevant information about engine oil is as follows: 1. Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), has a density of approximately 0.91×10³ (kg/m³). It serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. It is often referred to as the "blood" of a car. 2. Composition: Engine oil consists of base oil and additives. The base oil is the main component, determining the basic properties of the lubricant, while additives compensate for and improve the shortcomings of the base oil, providing certain new properties. Additives are an important part of engine oil.
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