Tell me about my different feelings about 5W20 and 5W30 oils.

First, the viscosity of engine oil is different: mainly the high temperature viscosity of engine oil. The difference between 5W-20 and 5W-30 is only the difference below. 5W-20 is relatively fuel-efficient (viscosity is between 5.6 and 9.3), and the vehicle feels lighter when driving, while 5W-30 is relatively high (viscosity is between 9.3- 12.5), so the relative fuel consumption and throttle are deviated.

Second, the sealing performance is different: the greater the viscosity, the better the sealing performance. The numbers after W of engine oil 5w30 and 5w20 represent high temperature viscosity, so the sealing performance of engine oil 5w30 is better than that of engine oil 5w20. However, the larger the number, the better, because the greater the viscosity, the greater the friction and the greater the power loss of the engine.

Extended data:

The role of engine oil:

1. Lubrication: there is rapid relative sliding between piston and cylinder, and between spindle and bearing bushing. In order to prevent the parts from wearing too fast, it is necessary to establish an oil film between the two sliding surfaces. There is an oil film with sufficient thickness to separate the surfaces of relatively sliding parts, so as to achieve the purpose of reducing wear.

2. Auxiliary cooling: Because the specific heat value of engine oil is low, and it has no cooling effect inside the engine. However, due to the heat generated by fuel combustion in the engine, when the engine is working, the engine oil can bring the heat back to the engine oil tank and then radiate it into the air to help the water tank cool the engine. What really plays a cooling role is the water (or antifreeze) outside the engine shell.

3. Cleaning: Good engine oil can bring carbides, sludge and worn metal particles on engine parts back to the oil tank through circulation, and wash away the dirt generated on the working surface of the parts through the flow of lubricating oil. Rust prevention and corrosion prevention: Lubricating oil can be adsorbed on the surface of parts to prevent water, air, acidic substances and harmful gases from contacting with parts.

Baidu encyclopedia-engine oil label