What does ACEA mean for engine oil?

[ChristianMarie]

ACEA in engine oil stands for the abbreviation of the European Automobile Manufacturers' Association. The functions of engine oil are: 1. Lubrication: Under various conditions, the ability of engine oil to reduce friction, slow down wear, and prevent metal sintering is called the lubricity of engine oil. The viscosity of engine oil is an important indicator for evaluating lubricity; 2. Low-temperature operability: The performance of engine oil to ensure easy starting and reliable fuel supply in low-temperature conditions is called the low-temperature operability of engine oil. The purposes of adding engine oil are: 1. To alleviate friction and high temperatures; 2. To reduce gas leakage and prevent external pollutants; 3. To prevent contact between water, air, acidic harmful gases, and parts; 4. To buffer the pressure rise at the engine cylinder port; 5. To flush away dirt generated on the working surfaces of parts.