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What does 15w_40 mean for engine oil?

1 Answers

VanMaci

07/29/25 10:41pm

W stands for WINTER, and the number before W represents the freezing point temperature. The freezing point temperature corresponding to 15W engine oil is -20℃. The number after W represents the kinematic viscosity of the oil at 100℃, with a higher number indicating higher viscosity. 40 indicates that at 100℃, the kinematic viscosity standard is between 12.5mm2/s and 16.3mm2/s. Below is a related introduction to engine oil: 1. Introduction to engine oil: Engine oil is the lubricating oil used in engines, composed of base oil and additives. The grade after the oil classification indicates its viscosity specification. The smaller the number before W, the better the low-temperature fluidity of the oil, indicating a lower usable environmental temperature and better protection for the engine during cold starts. The number after W is an indicator of the oil's high-temperature resistance, with a larger number indicating better protection performance at high temperatures. 2. Viscosity: Viscosity reflects the internal friction of the oil and is an indicator of the oil's oiliness and fluidity. When selecting lubricating oil, an appropriate viscosity and high-temperature viscosity index should be chosen to ensure that the oil has sufficient high-temperature viscosity to guarantee lubrication and sealing during engine operation, while also having sufficiently low viscosity at low temperatures to ensure cold-start performance.

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