api is the English abbreviation for the American Petroleum Institute. The api grade represents the quality grade of engine oil. It uses simple codes to describe the working capability of engine oil. sn is a category of api engine oil, representing a grade of oil quality, and sn is the gasoline anti-wear grade. Below is relevant information about engine oil: 1. The function of engine oil: Engine oil (also referred to as automotive lubricating oil, specifically the lubricating oil used in engines, hence the term engine oil is more appropriate) can lubricate and reduce wear, cool and lower temperature, seal and prevent leaks, prevent rust and corrosion, and provide shock absorption and cushioning for the engine. 2. The classification and composition of engine oil: Engine oils on the market can be broadly divided into mineral oils and synthetic oils based on their base oil (vegetable oils are not considered due to their scarcity). Synthetic oils are further divided into full synthetic and semi-synthetic. Among them, full synthetic oil is the highest grade. Engine oil consists of two parts: base oil and additives. The base oil is the main component of engine oil, determining the basic properties of the lubricating oil; additives can compensate for and improve the shortcomings of the base oil's performance, giving it certain new properties, and are an important part of the lubricating oil.
