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What season is 15W40 oil suitable for?

1Answers

McCharles

07/29/2025, 02:10:22 PM

15W40 oil is suitable for summer use. The designation 15W40 indicates that the oil has a viscosity grade of 15 in winter and is equivalent to a viscosity grade of 40 in summer. The 'W' stands for 'winter', and the smaller the number before it, the better the oil's low-temperature fluidity, meaning it can be used in lower environmental temperatures and provides better engine protection during cold starts. The number after the 'W' represents the oil's viscosity, with higher numbers indicating better performance. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of lubricating oil, determining its fundamental properties, while additives compensate for and improve any deficiencies in the base oil's performance, imparting certain new characteristics, making them an essential part of lubricating oil.

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