What Do the Parameters of Engine Oil Represent?

1 Answers
LaAlyssa
07/29/25 5:09pm
Here are the meanings of engine oil parameters: 1. Oil classification: Engine oil starting with "S" is specifically for gasoline engines, with a total of 13 quality grades from SA to SP. Diesel engine oil starts with the letter "C", and the grades are CA, CB, CC, CD, CE, CF, CF-4, CG-4, CH-4, CI-4, CJ-4. Whether it's a gasoline or diesel vehicle, each increment in the oil quality grade letter indicates superior performance compared to the previous one. 2. Oil viscosity specifications: Different types of engine oil have their own characteristics. For example, 15w40 oil: (1) The oil model containing the letter "W" stands for winter. "15" indicates the viscosity of the oil under low-temperature conditions. The smaller the number, the stronger the oil's cold resistance, making it easier to start the engine even at very low temperatures. (2) The last number "30" represents the kinematic viscosity standard at 100 degrees Celsius (between 9.3mm2/s and 12.5mm2/s).
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