What are the precautions for changing car engine oil?

[HaileyDella]

Precautions for changing car engine oil are as follows: 1. The selection of engine oil should be based on the requirements of the engine. It is unnecessary to use excessively high-grade oil in engines with lower requirements, nor should lower-grade oil be used in engines with higher requirements. 2. Multi-grade oil should be preferred as it has a longer lifespan, is more efficient, and provides better protection for the engine. During use, phenomena such as premature darkening or lower oil pressure compared to regular oil may occur, which are normal. 3. If the engine is in good condition and the seasonal temperature is low, it is advisable to use oil with lower viscosity to ensure smooth oil flow. In high-temperature seasons or when the engine is severely worn, using high-viscosity oil helps in forming an oil film and reducing engine wear.