What Does the Engine Oil Grade Chart Mean?

1 Answers
MacGavin
07/30/25 5:11am
Engine oil grade chart is a table that categorizes engine oils based on their quality grades and viscosity grades. Below is relevant information about automotive engine oil quality and viscosity: 1. Oil viscosity: Oil viscosity is often indicated using SAE grades, where SAE stands for the 'Society of Automotive Engineers'. Taking 10W-40 as an example, 'W' stands for winter, the number 10 indicates that this oil is suitable for an external minimum temperature of -25°C, and the number 40 indicates resistance to external high temperatures up to 40°C. 2. Oil quality: Automotive engine oils are specifically classified into 4 types for summer use, 6 types for winter use, and 16 types for all-season use, with different qualities and purposes. Summer oils are labeled as 20, 30, 40, and 50, where a larger number indicates higher viscosity and suitability for higher maximum temperatures. Winter oils are labeled as 0W, 5W, 10W, 15W, 20W, and 25W, with the symbol W representing the abbreviation for Winter.
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