This is critical because an engine requires lubrication immediately upon startup, and a thick, cold oil cannot flow effectively into the components. The "W" stands for Winter, and lower numbers like 0W, 5W, or 10W signify that the oil remains fluid in freezing temperatures.
Hot Weather Engine SAE Oil Guide: Choosing the Right Viscosity for Summer
In the context of oil, the SAE J300 standard defines the viscosity grades for engine oils. This dual-number format defines the classification of multi-grade oils, which are designed to work efficiently year-round.
As a result, a 10W-40 oil can flow like a 10-weight oil in the cold while providing the stability of a 40-weight oil during combustion. For example, an SAE 30 oil performed well in warm weather but became dangerously thick in winter.
Hot Weather Engine SAE Oil Guide: Choosing the Right Viscosity for Summer
Vehicle manufacturers specify the ideal viscosity in the owner’s manual, based on the design of the engine, the expected climate, and the desired fuel efficiency. An oil with a high viscosity flows slowly and resembles syrup, while a low viscosity oil flows quickly and resembles water.
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