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The Difference Between 5W40 and 10W40 Engine Oil

1 Answers

Peterson

07/29/25 9:35pm

5W40 and 10W40 engine oils differ in their applicable temperature ranges. Below are the key distinctions: 1. 5W40 indicates the oil's minimum applicable temperature is -30°C, whereas 10W40 signifies a minimum applicable temperature of -25°C. 2. The letter W stands for Winter, meaning oils with W are suitable for both winter and summer use. The number 40 represents the oil's high-temperature viscosity grade – the higher the number, the stronger the oil's high-temperature viscosity and the thicker the oil film. 3. Engine oil, also known as motor lubricant, serves multiple functions including lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, as well as shock absorption. It is often referred to as the 'blood' of a vehicle.

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