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What is the difference between 15w40 and 20w50?

1 Answers

DeChloe

07/25/25 11:12am

The differences between 15w40 and 20w50 engine oils are: 1. Different viscosity: The viscosity of 15w40 oil ranges between 13.5 to 16.0; while the viscosity of 20w50 oil ranges between 16.5 to 20.0. 2. Different pour points: The pour point of 15w40 oil is around minus twenty-five degrees Celsius; whereas the pour point of 20w50 oil is around minus nineteen degrees Celsius. The functions of engine oil include: 1. Reducing friction and high temperatures; 2. Cooling and temperature reduction; 3. Cleaning and purification; 4. Shock absorption and cushioning; 5. Rust and corrosion prevention. Engine oil, also known as motor lubricant, consists of base oil and additives. The base oil is the main component of lubricating oil, determining its fundamental properties, while additives can compensate for and improve any deficiencies in the base oil's performance.

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