What is the operating temperature range of 15w40 engine oil?
1 Answers
15w40 engine oil has an operating temperature range of -15°C to 40°C, making it a multi-grade oil suitable for all seasons. The functions of engine oil are: 1. To reduce friction and high temperatures; 2. To minimize gas leakage and prevent contamination from external pollutants; 3. To prevent contact between water, air, acidic harmful gases and engine components; 4. To cushion the pressure rise in engine cylinders; 5. To clean dirt generated on component surfaces. Signs indicating the need for oil change include: 1. Checking oil viscosity - oil without viscosity needs replacement; 2. The oil color turns black; 3. Excessive black particles, metal shavings, or carbon deposits in the oil; 4. Abnormal odor from the oil.