Engine oil is a type of oil used in internal combustion engines. This type of oil consists of various base materials and additives, which are used for the protection and better efficiency of engines. The base materials in motor oil can be from various sources such as crude oil, natural gas, plants, or synthetic compounds. Additives are also added to improve oil properties and increase engine life. Some features and important things about engine oil are: 1. **Viscosity:** - Engine oil viscosity is very important. This feature shows the oil's ability to maintain its viscosity coefficients in different temperature conditions. Oil with the right viscosity can maintain the engine well in different temperatures and conditions and prevent parts from wearing out. 2. **Additives:** Additives are added to motor oil to improve certain properties such as thermal stability, resistance to oxidation, cleanliness, and even reduction of wear and erosion. 3. Detergents and Dispersants: - These additives are used to control the formation of deposits and carbon inside the engine. They help clean the engine and prevent deposits from fuel combustion. 4. **Anti-Wear Agents:** - These additives are used to reduce the erosion and wear of engine parts and increase the useful life of the engine. 5. Corrosion Inhibitors: - These materials aim to prevent rusting of metal parts in the engine. 6. Pour Point Depressants: These additives help the oil to remain suitable for use at temperatures below its freezing point. 7. **Base Oil Type:** - The base materials may be crude oil, natural gas, plants, or synthetic compounds. The choice of the type of base material has a direct effect on It has the properties of oil. For example, synthetic oils, which are produced from synthetic compounds, may have more resistance to high and low temperatures and have better thermal stability. 8. Performance Standards: Engine oil must meet certain standards set by car manufacturers. These standards are used as a crossroads to ensure optimal performance and efficiency of the engine. 9. **Density Index and Viscosity Index:** - These indicators show changes in oil viscosity with temperature changes. A high density index indicates a reduction in the oil's sensitivity to temperature changes and, as a result, maintaining its properties at different temperatures. Engine oil, in addition, must be compatible with the type of engine (gasoline or diesel) and its needs. It is recommended to always refer to the vehicle manufacturer's engine oil manual and approved standards provided by the engine manufacturer to select the optimal engine oil for your vehicle. 10. **Resistance to oxidation and dispersion:** - Engine oil must have good resistance to oxidation (oxidation under the influence of oxygen) and dispersion (formation of deposits). These properties help maintain the oil's stability and prevent the dangers of oxidation and deposits. 11. **Fuel consumption:** Using engine oil with proper fuel consumption can help improve fuel efficiency and increase engine efficiency. 12. **Special combinations:** Some motor oils have special compounds that help improve performance in certain conditions, such as city traffic or long-distance travel. 13. ** Antifoam and antacids:** - These features are very important to protect the internal parts of the engine from corrosion and rust. 14. **Compatibility with gas purification systems:** - The engine oil must be compatible with the gas purification systems in the car and prevent the formation of deposits due to interference with these systems. 15. **Compatibility with car stop and start systems:** - In the condition of stopping and starting the car, the engine oil must be able to maintain the protective layers on the internal surfaces of the engine. 16. **impact on the environment:** Some motor oils, especially synthetic oils, have measures to reduce negative effects on the environment. In general, choosing the correct engine oil depends on the recommendations of the car manufacturer, the type of engine (gasoline or diesel), the weather conditions of the area, and the type of driving (city or highway). It is also important to determine the engine oil change intervals and the manufacturer's recommendations should be followed.