Is 5W30 Engine Oil Suitable for All Seasons?

1 Answers
OJames
07/29/25 4:15pm
5W30 engine oil is suitable for all seasons. Engine oils can be classified into full synthetic oil, semi-synthetic oil, and mineral oil based on their grades. The 'W' stands for winter, and the number before 'W' represents the oil's fluidity at low temperatures—the smaller the number, the better the fluidity. The number after 'W' indicates the oil's viscosity grade at high temperatures (100°C)—the larger the number, the higher the viscosity, and the better the protection for the engine. Engine oil is a substance enhanced with additives in base oil, primarily containing anti-wear additives, detergents, dispersants, and multi-grade oil viscosity index improvers.
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