First, let's start with the number on the oil drum. We often see SAE and API on the outer packaging of motor oil. SAE is the abbreviation of American Society of Automotive Engineers, API is the abbreviation of American Petroleum Institute. The SAE label after the oil viscosity number, and the API label after the oil quality class.

10W-40 is its SAE standard viscosity value. This viscosity value first indicates that the oil is a multi-grade lubricating oil. W stands for WINTER and the number before W stands for pour point temperature, which is simply the freezing point temperature. 10W oil corresponding freezing point temperature is -25℃, other common 0W is -35℃, 5W is -30℃, 15W is -20℃. The number after W represents the kinematic viscosity of the oil at 100℃. The higher the number, the higher the viscosity. 40 represents a standard kinematic viscosity between 12.5mm2/s and 16.3mm2/s at 100 ° C, not something that some anecdotal claims can be used at 40 ° C. To know, the temperature of the engine running is not necessarily dependent on the environmental temperature, the engine temperature of long time high rotation can easily reach 100℃, but we do not have 100 grade lubricating oil at present.

In addition, oil product labels often have ILSAC, ACEA, JASO certification and a bunch of automobile manufacturer standards certification, for ordinary users, these standards are on the line.

Oil viscosity is a very important part in the selection of oil, which will directly affect fuel consumption, noise, speed sense and other aspects. For the less troublesome car owners, we strongly recommend that you choose the oil according to the viscosity requirements on the original manufacturer's manual, because that is safe. For players who like to "screw around", we offer a few basic formulaic points: the lower the viscosity of the oil will be better and more fuel efficient, the higher the viscosity of the oil will be the opposite; Low viscosity oil is relatively suitable for new cars, and it is recommended to use high viscosity oil for engines with long life and large wear.

If your car is heavily modified, the engine speed often reaches the red zone, or you drive a supercharged engine or a new high performance engine, we recommend you to choose a sticky synthetic oil, is 40 or above. Because of the precise structure, the high compression ratio of the natural intake engine or the supercharged engine at higher temperatures at work, requires the oil to have better high-temperature shear resistance. The use of a relatively sticky oil may also reduce some abnormal oil consumption.

In northern China, due to the large temperature difference between winter and summer, oil with different viscosity values may be used in two seasons. According to the manual or 4S shop requirements on time to replace the winter and summer oil.

There are many lubricating oil manufacturers in the world. In addition to China's Great Wall, Uni-President, Kunlun and other brands, some mainstream lubricating oil brands in the world include Shell, Mobil, Castrol, TOTAL, PETRONAS and so on, and some other brands that car players like very much: MOTUL, Redline, AMSOIL, SPEEDMASTER, etc. These brands of oil have sponsored a lot of car events, and some manufacturers choose the original oil, the quality is reliable. If someone recommends some small brands of oil to you, check the reputation of the use of these oils, and then carefully choose. Especially those TV shopping or radio shopping in the sale of unknown oil, when buying to be cautious.

Each brand requires different oil change cycle, we strongly recommend to follow the instructions to replace the oil and oil filter on time. Now some imported oil can be used continuously for more than 20,000 kilometers, but is limited to the domestic air quality, oil products, the life of the original oil filter and other bottlenecks, we suggest that the owners do not easily try. In addition, if the air condition of the road you drive is extremely bad, or the road condition you drive every day is very congested, we suggest shortening the oil change period appropriately.