发动机润滑油的主要作用有润滑、冷却、清洗、密封、防锈、传动等六种。润滑:发动机的主要部件都要依靠它来润滑,以减少磨损,降低摩擦阻力,使发动机能长时间工作。冷却:发动机气缸中发出的总热量大约有1.5%～5%要通过受热的机件传入到润滑油当中,否则机件就无法正常工作。为此润滑油必须以3-35升/分的流量进行循环完成冷却的重要任务。清洗为了保证 The main role of engine oil lubrication, cooling, cleaning, sealing, rust, transmission and other six. Lubrication: The main engine components have to rely on it to lubricate to reduce wear and reduce frictional resistance, so that the engine can work long hours. Cooling: The total amount of heat emitted by the engine cylinder is about 1.5% ~ 5% to pass through the heated parts into the lubricant, otherwise the parts will not work properly. For this purpose, the lubricant must be circulated at a rate of 3-35 liters / min to accomplish the important task of cooling. Cleaning in order to guarantee