What does SM grade mean for engine oil?

1 Answers
VonElena
07/29/25 7:19pm
According to the API (American Petroleum Institute) classification, which is an important standard for grading the quality of engine oil, the "SM" grade represents the highest level, indicating the best performance of the engine oil. Below is an introduction to engine oil: 1. Functions of engine oil: The primary functions of engine oil are lubrication, cleaning, and heat dissipation. In fact, engine oil is used in many parts of a vehicle, but the oil that needs to be replaced every 5,000 kilometers refers to the engine oil. Most people generally use semi-synthetic or fully synthetic engine oil, while conventional oil is rarely used. Conventional oil is typically used in agricultural machinery, three-wheeled vehicles, and motorcycles. 2. Replacement intervals: Conventional oil: 5,000 kilometers, semi-synthetic oil: 7,500 kilometers, fully synthetic oil can go up to 10,000 kilometers before the next maintenance.
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