What are the precautions for changing car engine oil?

[DelAdriel]

Precautions for changing car engine oil include: 1. Choose engine oil based on the engine's requirements. Do not use high-grade oil in lower-performance engines, nor low-grade oil in high-performance engines. Select oil that matches the engine specifications. 2. Opt for multi-grade oil, which offers advantages such as fuel economy, extended service life, and high efficiency, providing better protection for the engine. 3. The oil level should be slightly below the mark on the dipstick. Excessive oil can increase crankshaft rotation resistance and reduce engine output power. 4. Select oil with different viscosity based on the engine's operating conditions. If the engine is in good condition and the seasonal temperature is low, use oil with lower viscosity. If the engine is severely worn and the seasonal temperature is high, choose oil with higher viscosity.