What Does Engine Oil Grade Mean?

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Engine oil grade typically indicates viscosity and quality. Taking the grade 5W/30 as an example for detailed explanation: 1. First, the "W" in the oil grade stands for winter. 2. The "5" indicates that the oil has reliable low-temperature starting performance at -30 degrees Celsius. The smaller the number, the better the oil's cold resistance. 3. The 30 represents the kinematic viscosity standard at 100 degrees Celsius (between 9.3mm2/s and 12.5mm2/s). The three most commonly used types of engine oil currently: 1. Mineral oil: This type is directly refined from crude oil extracted from underground, containing more impurities and being cheaper in price. 2. Semi-synthetic oil: Based on mineral oil with the application of hydrocracking technology, it has seen significant improvements in both performance and purity. 3. Full synthetic oil: Synthesized from various natural substances, it can modify the characteristics of oil molecules as needed. It excels in cold starts, fuel economy, and extending mechanical lifespan, making it highly favored in the market, though it is also considerably more expensive.