Why is it beneficial to use low viscosity engine oil?

Using low viscosity engine oil is beneficial because it generates less friction in the engine, which helps improve the overall efficiency and performance of the vehicle. This reduction in friction leads to lower operational temperatures and can significantly reduce fuel consumption, contributing to better fuel economy.

However, the third choice regarding disposal of engine oil as household waste is incorrect. In Germany, used engine oil is classified as hazardous waste and must be disposed of at designated collection points, not as household waste. Therefore, it's important to select only valid options that align with the guidelines for engine efficiency and environmental safety as enforced by German regulations. Understanding the correct options helps ensure compliance with these regulations and promotes better vehicle maintenance practices.