What does 5w40 engine oil mean?

1 Answers
LeLuna
07/29/25 4:33am
Engine oil 5w40 meaning: The letter "w" stands for winter; "5" represents the cold start performance of the engine oil, with a smaller number indicating stronger cold resistance of the oil; "40" is an indicator of the oil's high-temperature resistance, representing the kinematic viscosity of the oil at 100 degrees Celsius. The higher this number, the greater the viscosity and the stronger the high-temperature resistance. Engine oil consists of two parts: base oil and additives. The base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve the deficiencies in the base oil's performance, imparting certain new properties, making them an important part of lubricating oil.
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