**Lubricating oil** is essential for the proper functioning of a vehicle's engine. Its main function is to **distribute the oil throughout all parts of the engine** to create a protective layer that prevents friction between the parts, thus reducing their wear. This is crucial to keep the engine in good condition for a longer time.

- The oils used in vehicles are **special substances** that help protect engine parts and prevent their premature wear.
- Changing the oil periodically ensures that the engine is always protected with oil in **good condition**, which prolongs its lifespan and minimizes the wear of the parts.
- Additionally, synthetic oils, which are more common today, offer better protection for the engine, as they are more resistant to extreme temperatures and last longer. This means that the engine is better protected and the oil needs to be changed less frequently.

Therefore, keeping the oil in good condition is fundamental for the **good condition of the engine** and to reduce the wear of its components.