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What is the difference between SL and SN?

1 Answers

SanSophie

07/29/25 12:59pm

SN has a higher oil grade than SL. The API classification represents the quality grade of engine oil. It uses simple codes to describe the working capability of engine oil. Oil grades are classified into SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, and SN levels, with the later letters indicating progressively higher grades. SN is currently the highest-grade engine oil. Below is a relevant introduction: 1. Engine oil overview: Engine oil, also known as engine lubricant, has a density of approximately 0.91×10³ (kg/m³). It serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. It is often referred to as the 'blood' of a car. 2. Oil composition: Engine oil consists of base oil and additives. The base oil is the main component of lubricating oil, determining its fundamental properties, while additives compensate for and improve any deficiencies in the base oil's performance, providing new characteristics. Additives are an essential part of lubricating oil.

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