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What is the difference between 5w30 and 0w20 engine oil?

1 Answers
VonJack
07/28/25 6:05pm
The difference between 5w30 and 0w20 engine oil lies in their applicable environmental temperatures: 5w30 engine oil is suitable for temperatures as low as -30 degrees Celsius, while 0w20 engine oil is suitable for temperatures as low as -35 degrees Celsius. The functions of engine oil are: 1. To alleviate friction and high temperatures; 2. To reduce gas leakage and prevent external pollutants; 3. To prevent contact between water, air, acidic harmful gases, and parts; 4. To buffer the rise in pressure at the engine cylinder port. The characteristics indicating the need for an oil change are: 1. Check the oil viscosity—if there is no viscosity, the oil needs to be changed; 2. The oil color turns black; 3. Excessive black particles, metal shavings, or carbon deposits in the oil; 4. The oil has an unusual smell.
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