How to Distinguish Between Full Synthetic Oil and Semi-Synthetic Oil?

[MiguelDella]

Distinguishing between full synthetic oil and semi-synthetic oil can be done by checking the packaging: full synthetic oil will be labeled as 'full synthetic,' while semi-synthetic oil will be labeled as 'synthetic oil.' 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 protect parts from contact with water, air, acidic gases, and other harmful substances; 4. To cushion the pressure rise in the engine cylinder; 5. To clean away dirt generated on the surfaces of working parts. Signs that indicate the need for an oil change include: 1. Checking the oil viscosity—if it lacks viscosity, the oil needs to be replaced; 2. The oil color turns black; 3. Excessive black particles, metal shavings, or carbon deposits in the oil; 4. An unusual smell from the oil.