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What is the Engine Oil Grade Chart?

2 Answers

MaverickLynn

07/29/25 6:45pm

Currently, gasoline engine oils are classified into grades SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN, and SP; diesel engine oils are classified into grades CA, CB, CC, CD, CD-II, CE, CF-II, CF-4, CG-4, CH-4, and CI-4. Below is more related information: Classification based on SAE viscosity grades: 1. Engine oils are classified according to SAE viscosity grades, with 6 types for winter, 5 types for summer, and 16 types for all-season use. 2. There are 6 types of winter engine oils: 0W, 5W, 10W, 15W, 20W, and 25W. The 'W' stands for Winter, and the smaller the number before it, the greater the oil's fluidity and the lower the applicable temperature. 3. There are 5 types of summer engine oils: 20, 30, 40, 50, and 60. The larger the number, the higher the oil's viscosity and the stronger its high-temperature protection performance, making it suitable for higher temperature environments. 4. There are 16 types of all-season engine oils: 5W20, 5W30, 5W40, 5W50, 10W20, 10W30, 10W40, 10W50, 15W30, 15W40, 15W50, 20W20, 20W30, 20W40, and 20W50.

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MacEmersyn

08/14/25 12:14pm

The oil classification system is essentially a way to categorize automotive engine oils. Many car owners initially find it confusing, but it mainly consists of API and SAE ratings. API indicates the oil's quality level—the higher the grade, the better the protection. For example, SN-grade oil can prevent engine carbon buildup. SAE is the viscosity rating; in 5W-30, the 'W' stands for winter performance, and a lower number means better cold-start flowability. Don’t underestimate this chart—using the wrong oil can accelerate engine wear, increase fuel consumption, and even trigger warning lights. I recommend checking the owner’s manual before each service to select oil that meets the standard, and choosing the right viscosity based on local climate (e.g., low-temperature grades for northern regions). Regularly inspecting the oil’s condition is also a good habit—if it turns black, it’s time for a change. In short, understanding this system helps your car run longer and smoother while saving you unnecessary expenses.

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