What is the best engine oil for family cars?

At present, the engine oil on the market can be simply divided into 1 according to the different base oils. Mineral oil 2. Synthetic oil can be divided into semi-synthetic engine oil and whole synthetic engine oil. The biggest difference between mineral engine oil and synthetic engine oil is that synthetic engine oil has wider service temperature, longer service life and higher cost. For the same oil film requirement, synthetic oil can be achieved with lower viscosity, while mineral oil needs higher viscosity than synthetic oil to achieve this requirement. In the same working environment, the service life of synthetic oil is much longer than that of mineral oil, so the cost is higher, but compared with the number of oil changes, it is not much higher than that of mineral oil.

Engine oil is also lubricating oil, and the viscosity of lubricating oil is often marked with SAE and other brands. SAE is the abbreviation of American Society of Automotive Engineers. For example: SAE 15W-40, SAE5W-40, and "w" means winter (winter). The smaller the number before it means the better the low-temperature fluidity of engine oil, which means the lower the available ambient temperature, the better the engine protection ability during cold start. The number after "W" (with a horizontal one behind it) is the index of high temperature resistance of engine oil. The larger the number, the better the protective performance of oil at high temperature. (SAE) Applicable ambient temperature (C): 5w can withstand external low temperature-30 C, 10w can withstand external low temperature-25 C, 15w can withstand external low temperature-20 C, 20w can withstand external low temperature-15 C, and 30w can withstand external low temperature.

The suitable external temperature range of 5W-40 engine oil is -30℃ to 40℃; ; The applicable external temperature range of 10W-30 engine oil is-25 C to 30 C. ..