At present, the common engine oils on the market are sn grade and sl grade. Many car owners don't know much about engine oil. I don't know the difference between these two oils. So which is better, sn or sl grade engine oil?
The classification of engine oil is based on the quality grade. According to the classification of API standard, from "SA" to "SP", with each additional English letter, the performance of engine oil will be improved by one, which is better than the previous one. At present, SP is the largest grade engine oil, and SN is second only to SP.
Sn and sl are engine oil brands formulated by API gravity, referred to as API for short. They use simple codes to indicate the working ability of oil. The general grades of engine oil are Sa, Sb, Sc, Sd, Se, Sf, Sg, Sh, Sj, Sl, Sm and Sn. The lower the second letter, the stronger the working ability of the oil. Sn engine oil is the highest grade engine oil at present, so sn engine oil is better than sl engine oil.
Although learning to distinguish and choose different grades of engine oil is the key, at the same time, we should always pay attention to whether our vehicle engine oil storage is sufficient.
Sn engine oil is generally fully synthetic, sl engine oil is generally semi-synthetic, and synthetic engine oil is the best engine oil. When choosing engine oil, car owners need to refer to the situation of their own vehicles and consider their own economic level. In the affordable range, choose the engine oil suitable for your vehicle, not the most expensive engine oil but the best.
In terms of performance, sn grade engine oil has the best quality. According to APL standard classification, from "sa" to "sn", the performance of engine oil will increase with the increase of each letter, which is better than the previous one.
In terms of price, sn is more expensive than sl. The higher the grade, the higher the oil price.
Sn grade engine oil is mainly improved from high temperature detergency. Compared with sl-grade engine oil, sl-grade engine oil does not have very high high-temperature detergency, and SL-grade engine oil does not require high phosphorus content, but only requires no more than 0. 1%. Turbocharged engines have very high requirements for engine oil, so they are very suitable for sn-grade engine oil.