What is the function of engine oil in a combustion engine?

In a combustion engine, engine oil serves three main functions: wear protection, cooling, and cleaning.

1. **Wear protection**: Engine oil lubricates moving parts, reducing friction and preventing excessive wear. This is crucial for the longevity of the engine and is highlighted in regulations that focus on vehicle safety and maintenance.

2. **Cooling**: Engine oil helps dissipate heat generated by the engine's operation. Effective cooling reduces the risk of overheating and engine failure, which is important for safe vehicle operation.

3. **Cleaning**: Engine oil carries away dirt, debris, and contaminants from engine parts, preventing buildup that could cause damage. This function is essential for maintaining optimal engine performance and compliance with emissions standards.

Understanding these functions is important for adherence to German traffic laws, which require vehicles to be properly maintained to ensure safety and reduce environmental impact. Neglecting oil maintenance can lead to engine damage and increase the risk of accidents.