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What does the 'w' in motor oil specifications mean?

1 Answers

MacGabriela

07/30/25 12:07am

The letter 'w' in motor oil specifications stands for 'winter', indicating that the oil is suitable for use in winter conditions. If an oil specification includes 'w', it means the oil can function normally during winter. Common oil specifications include 5w30, 5w40, 0w30, 0w40, etc. The number before 'w' indicates the oil's low-temperature flow performance, with 0w meaning the oil can flow normally at temperatures as low as -35 degrees Celsius. Relevant information about motor oil is as follows: 1. Introduction: Motor oil, also known as engine lubricating oil (English name: Engine-oil), has a density of approximately 0.91×10³ (kg/m³). It serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is often referred to as the 'blood' of a car. 2. Composition: Motor oil consists of base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve any shortcomings in the base oil's performance, providing certain new characteristics. Additives are an essential part of lubricating oil.

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