What is the difference between 15w40 and 10w40?

1 Answers
StJaxon
07/29/25 10:24pm
The main difference between 15w40 and 10w40 engine oils lies in their low-temperature fluidity. Engine oil primarily serves the following functions: 1. It effectively protects internal engine components, reducing wear and preventing aging. 2. Inside the engine, it minimizes mechanical friction resistance, ensuring smoother operation. 3. It helps lower the internal temperature of the engine, aids in heat dissipation, prevents rust and aging of internal parts, and extends the engine's service life.
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