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How is motor oil classified into grades?

2 Answers

SanDavid

07/30/25 1:21am

Currently, the market categorizes motor oil into three types: mineral oil, semi-synthetic oil, and synthetic oil. The corresponding oil grades are: SA to SJ are mineral oils, SJ and SL are semi-synthetic oils, and SM and SN are full synthetic oils. Relevant information about motor oil is as follows: 1. Introduction: Motor oil, also known as engine lubricating oil, with the English name: Engine-oil. It has a density of approximately 0.91×10³ (kg/m³) and serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. It is hailed as the 'blood' of a car. 2. Composition: Motor oil consists of two parts: base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil's performance, imparting certain new properties, making them an important part of lubricating oil.

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VonFinley

08/15/25 6:59am

I've been researching engine oil for several years, and the grading system mainly consists of two major categories: API and SAE. API indicates performance levels, with the S series and C series. For example, the S series ranges from SA to the latest SP—the newer the letter, the better the protection, handling high temperatures and wear. SAE represents viscosity grades, like 5W-30. The '5W' means it flows smoothly even in winter temperatures below zero, while '30' ensures it doesn’t thin out too much in summer heat. When choosing oil, always check your car’s manual—don’t blindly opt for higher grades, or you’ll just waste money. Oil grades also need regular updates as new car designs evolve. For instance, my friend switched to SP-grade oil and saw reduced fuel consumption and less engine carbon buildup. Remember to change your oil on schedule—grades aren’t just about extending engine life but also saving money. I personally experienced louder engine noise with a lower API grade, so understanding grades helps avoid pitfalls.

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