What does 15w-40 mean for engine oil?

1 Answers
LeHarper
07/29/25 3:19pm
Engine oil 15w-40 refers to the viscosity of the oil, indicating its applicable temperature range from -20 degrees Celsius to 40 degrees Celsius. Below is an introduction to engine oil 15w-40: 1. The 'w' stands for winter-grade oil. The smaller the number before 'w', the lower the ambient temperature the oil can be used in. The number after the hyphen represents the ambient temperature for non-winter use, with a higher number indicating a higher applicable ambient temperature. 2. Engine oil, also known as motor lubricant, serves to lubricate and reduce friction in the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption.
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