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What does 10w-40 mean on engine oil?

1 Answers

MichaelLynn

07/25/25 12:13pm

Engine oil 10w-40 is a type of engine oil, and here is its detailed explanation: 1. The 'W' stands for WINTER. The number 10 before the 'W' represents the freezing point temperature. The freezing point temperature for 10W engine oil is -25°C. The number after the 'W' represents the kinematic viscosity of the oil at 100°C. The higher the number, the higher the viscosity. 2. The grade after the oil classification indicates its viscosity specification. The smaller the number before the 'W', the better the low-temperature fluidity of the oil, indicating a lower usable environmental temperature and better protection for the engine during cold starts. 3. The smaller the number before the 'W', the lower the low-temperature viscosity, the better the low-temperature fluidity, and the lower the minimum applicable temperature. For numbers like 20, 30, 40, and 50, the larger the number, the higher the viscosity, and the higher the maximum applicable temperature. 5W is suitable for -30°C environmental temperature; 10W is suitable for -25°C environmental temperature; 15W is suitable for -20°C environmental temperature; 20W is suitable for -15°C environmental temperature; 30 is suitable for 30°C environmental temperature; 40 is suitable for 40°C environmental temperature; 50 is suitable for 50°C environmental temperature.

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