What are the precautions when adding engine oil to a car?

[DeCamille]

Precautions when adding engine oil to a car include: 1. When selecting engine oil, strictly follow the oil grade specified by the vehicle. If the same grade is not available, only a higher-grade oil can be used, and a lower-grade oil should not be substituted; 2. The oil level should be slightly below the mark on the dipstick. Exceeding the upper limit on the dipstick will increase the rotational resistance of the crankshaft and reduce the engine's output power; 3. If the engine is in good condition and the seasonal temperature is low, it is advisable to use oil with a lower viscosity to ensure smooth oil flow; 4. After completing the oil change, also check for any leaks at the engine oil pan drain plug and the oil filter sealing interface.