润滑油在发动机的运转中起着至关重要的作用。相对运动的零部件之间必须有充分的油膜间隔才能避免直接接触而发生严重磨损;油液的流动能够带走热量,为部件降温;同时带走磨料和碎屑,避免二次磨损。润滑油覆盖在零件表面,还能防止氧化锈蚀,中和酸性物质,防止零件腐蚀等。这些仅仅是润滑油的一 Lubricating oil plays a crucial role in the operation of the engine. Relatively moving parts must have adequate oil film spacing to avoid direct contact with severe wear and tear; the flow of oil can remove heat and cool the part; and carry abrasive and debris away from secondary wear. Lubricants cover the surface of parts, but also to prevent oxidation corrosion, neutralization of acidic substances, to prevent parts corrosion. These are just one of the lubricants