Why is it beneficial to use low viscosity engine oil?

You answered correctly. Low viscosity engine oil creates less friction inside the engine. This allows engine parts to move more smoothly, leading to reduced wear and more efficient operation. As a result, the engine needs less energy to run, which lowers fuel consumption. However, low viscosity engine oil cannot be disposed of as household waste because it is hazardous and must be taken to a proper recycling or disposal facility. Understanding this helps you choose the right oil and handle it responsibly, supporting both engine efficiency and environmental protection.