What is the difference between 5W30 and 10W30 engine oil?

1 Answers
DakotaDella
07/25/25 10:07am
5W-30 and 10W-40 are two different engine oil grades with distinct performance characteristics. Here are their differences: 1. Low temperature: 5W-30 performs better than 10W-40 in cold-start conditions. 2. High temperature: 10W-40 offers better high-temperature stability compared to 5W-30. Additional information: 1. 10W-40 represents its SAE standard viscosity rating, indicating it's a multi-grade oil. 2. The number before W indicates the oil's flow performance at low temperatures - the smaller the number, the better the cold-start performance. 3. The number after W represents the oil's stability at high temperatures (i.e., resistance to thinning) - the larger the number, the better the high-temperature stability.
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