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What is the difference between 10w-40 and 10w-50 engine oil?

1 Answers
KeiraLynn
09/06/25 4:16am
10w50 and 10w40 engine oils differ in viscosity, with 10w50 having higher viscosity. Below are relevant details about engine oil: 1. Introduction: 0w indicates the oil can flow normally at -35°C, while 10w means it can flow at -25°C. Both 10w40 and 10w50 oils have the same low-temperature flow performance but different viscosities. The number after 'w' represents the oil's high-temperature viscosity - the higher the number, the greater the viscosity. 2. Viscosity: Generally, naturally aspirated engines can use 30-viscosity oil, turbocharged engines require 40-viscosity oil, while high-performance, large-displacement engines need 50 or 60-viscosity oil. When selecting oil, always choose the appropriate viscosity based on your car engine's technical specifications, otherwise it may affect engine performance.
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