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What are the levels of SAE and SN motor oil?

2 Answers

McRebecca

07/29/25 2:20am

Motor oil SAE is an internationally recognized classification representing the viscosity standard of motor oil, while SN is the API standard in the United States, representing the quality of the oil, with SN-grade oil being the best. SN-grade is currently the highest level of motor oil. SJ was the standard in the 1990s, SL in 2001, SM in 2004, and SN in 2010. Among international brands, most motor oils are above SF-grade. Below is some relevant information about motor oil: 1. Function of motor oil: Motor oil can lubricate and reduce wear in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. It is known as the 'blood' of a car. Choosing the right motor oil and changing it regularly can maintain the engine in good condition and extend its lifespan. 2. Choosing motor oil: The choice of motor oil is not about selecting the most expensive one, but rather about choosing the right oil based on the characteristics of the car's engine and driving habits. It can be categorized by winter-use and summer-use oils. For winter, the primary consideration is the low-temperature viscosity grade, while in summer, due to high temperatures, there is no need to choose oil with a better low-temperature viscosity grade.

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McDominic

08/12/25 6:18am

As a veteran driver with over 20 years of experience, I have deep insights into oil grades. SAE refers to oil viscosity - like the 5W-30 numbers, where smaller numbers mean smoother winter starts and larger numbers provide better protection in hot weather. SN is the latest API standard, indicating good rust prevention, cleaning performance, reduced emissions, and compatibility with new engines. Choosing the right grade saves fuel, improves driving experience, and extends engine life by several years. I recommend checking your car's manual for specified SAE and API grades - don't cheap out with random products. Remember to change oil regularly without delaying intervals - my old car's exhaust became much cleaner after switching to SN grade. Use lower viscosity SAE oil in winter for easier starts, and slightly higher viscosity in summer to prevent wear.

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