How to choose automobile oil in spring and summer? What viscosity is better?

When choosing the viscosity grade of lubricating oil in spring, it is necessary to consider the load, speed and wear of the engine. If the engine has a heavy load, low speed or serious wear, the lubricating oil with higher viscosity should be selected, otherwise the lubricating oil with lower viscosity should be selected.

Generally, 5W-30 has better fluidity than 5W-40, which can reduce fuel consumption and quickly dissipate heat for the engine. For older cars, the noise of engine with 5W-30 oil is slightly higher than that of engine with 5W-40 oil. For engines that strictly require the use of 5W-40, if 5W-30 is used, it may consume more engine oil than normal, which is also commonly known as burning engine oil. At the extremely high temperature of the engine, 5W-40 has better oil stability than 5W-30. Car owners can choose according to their own car conditions.