How to distinguish the types of engine oil?

There are three kinds of engine oil: summer engine oil, winter engine oil and four seasons engine oil.

1. The brands of oil used in winter are: 0W, 5W, 10W, 15W, 20W and 25W respectively. The symbol W stands for winter. The smaller the number before W, the lower the low-temperature viscosity, the better the low-temperature fluidity and the lower the applicable minimum temperature.

2. The brands of oil used in summer are: 20, 30, 40 and 50 respectively. The higher the numerical value, the greater the viscosity and the higher the applicable maximum temperature.

3. The brands of general-purpose oil in winter and summer are: 5W/20, 5W/30, 5W/40, 5W/50, 10W/20, 10W/30, 10W/40,10w/respectively. 20W/30, 20W/40, 20W/50, the smaller the number representing the winter part, the larger the number representing the summer part, the higher the viscosity, and the wider the applicable temperature range.

(1) high temperature type: the number indicates the viscosity at 100℃, and the higher the number, the higher the viscosity.

(2) Low temperature type: W means only used in winter. The smaller the number, the lower the viscosity and the better the low-temperature fluidity.

(3) All-weather type: It means that the viscosity grade meets the requirements of SAE 15W, 10W and 5W respectively at low temperature, and meets the requirements of SAE40 and SAE 50 respectively at high temperature, so it is a universal type in winter and summer.

Extended data

Engine oil, that is, engine lubricating oil, is known as the "blood" of automobile, which can play the roles of lubrication, cleaning, cooling, sealing, reducing wear, rust prevention and corrosion prevention.

The engine is the heart of a car. There are many metal surfaces rubbing against each other in the engine. These parts move fast and the environment is harsh, and the working temperature can reach 400℃ to 600℃. Under such harsh working conditions, only qualified lubricating oil can reduce the wear of engine parts and prolong their service life.

Engine oil. The density is about 0.9 1× 10? (kg/m？ ) can play the role of lubrication, wear reduction, cooling, sealing and leakage prevention, rust prevention and corrosion prevention, shock absorption and buffering for the engine. Synthetic oils are divided into: fully synthetic and semi-synthetic.

Base oil is the main component of lubricating oil, which determines its basic properties. Additives can make up for and improve the shortcomings of base oil properties and give some new properties, which is an important part of lubricating oil.

Reference oil standard _ Baidu Encyclopedia