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What does 15w40 engine oil indicate?

1 Answers

VanGrace

07/29/25 8:11pm

15w40 engine oil indicates: 15 represents that the oil is suitable for temperatures above minus twenty degrees Celsius, w stands for winter, and 40 represents the oil viscosity. The higher the number, the greater the oil viscosity, the better the high-temperature protection performance, and the correspondingly greater the resistance. The functions of engine oil are: 1. Lubrication to reduce wear; 2. Assisting the radiator in cooling the engine; 3. Flushing dirt off engine components; 4. Buffering the load on connecting rods and crankshaft bearings; 5. Preventing external contaminants from entering. The method for changing engine oil is: 1. Remove the engine oil filter; 2. Unscrew the oil pan drain plug to drain the oil; 3. Install the drain plug; 4. Tighten the screws, pour the oil into the engine, and install the oil filter.

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