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The 'W' in 15w 40 refers to 'Winter' the cold weather conditions viscosity of the oil. 15W40 engine oil consists of the cold weather properties of 15W oil as well as the high temperature viscosity of a 40.

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10y ago
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12y ago

The engine oil grade is multigrade.The first number 15 stands for the minimum temperature applciation at 15degree centigrade.The second number 40 stands for the viscosity in cSt(centistokes)

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15y ago

The 15w will be slightly thicker in cold weather.

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Q: What is meaning of 15w40?
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