What are the precautions for changing gasoline grades?

[DiLena]

The main precautions for changing gasoline grades are as follows: The viscosity of the engine oil should be as low as possible: Under the premise of ensuring reliable lubrication of the engine, the viscosity of the engine oil should be as low as possible. High-viscosity engine oil is only suitable for severely worn engines or for use in the southern summer. Blindly choosing high-viscosity engine oil will increase the resistance during engine operation, thereby increasing fuel consumption. Multi-grade oil should be used whenever possible: Multi-grade oil has excellent viscosity-temperature performance, lasts longer in engines, saves fuel, is suitable for all seasons, and is easier to manage. When using multi-grade oil, the oil color tends to darken, and the oil pressure is slightly lower than that of conventional oil. These are normal phenomena and do not affect usage.