When you buy Engine Oil from the market, you will find that there are different digits or symbols on the package, especially on small drums, and that the price of the same volume of oil often varies widely, and the feeling of using it is different.
So what is the relationship between these digital or alphabet symbols on the engine oil packaging and the quality of the oil?
Choose oil, in addition to "quality control" in the sense of "good or bad ", but also" product grade "in the sense of" high or low ". For the general user, understanding the brand number of oil is the first step in the purchase of oil. In addition to the name of the oil, the oil barrel produced by the regular manufacturer indicates the brand number of the oil.
The oil brand reflects the quality and viscosity grade of the engine oil, and contains two codes:
Code 1: quality grade (API grade) gasoline oil (represented by "S ", the higher the quality grade indicated by the following letter) is divided into SE, SF, SG, SH, SH, SJ, SL, SM, SN. diesel oil (represented by “c ”) is divided into cc, cd, ce, cf, cf-4, ch-4, ci-4, etc. for the comprehensive performance of oil in resistance to wear, prevent oxidation, control soot, prevent carbon accumulation, save fuel, etc., the higher the grade of oil from before to after, the better performance.
Code 2: The viscosity grade (SAE grade) is 0W,5W,10W,15W,20W,25W,20,30,40,50,60, respectively, which is used to indicate the viscosity of engine oil, and the greater the viscosity of oil is when the oil is used in winter, the smaller the smaller the pre-W number is, the better the fluidity of oil is at low temperature, the more suitable the oil is used at low temperature;5W-50,10W-30,15W-40 and so on is called multi-stage oil, which has the common performance in summer (relative,5W,50,10W,30W,15W,40 and so on), the wider the temperature range is applicable.
When you buy oil, be sure to meet the manufacturer's recommended specifications (that is, the SAE label mentioned above) requirements, while checking whether the oil has passed the corresponding certification, such as SL, SM and SN environmental protection grade and various performance grades.
To sum up, according to the recommended model to choose the appropriate viscosity and grade, combined with their own economic strength and use of demand is a good choice.
