求翻译：润滑系统主要作用就是对专用车发动机的各个部件进行有效的润滑，以防过度磨损。在常规情况下，专用车每行驶5000km－10000km时就需清洗保养一次，在遇到发动机噪音过大，加速无力，水温过高时也需清洗保养一次。清洗发动机内部的油泥和其它积物，避免机油高温下的氧化稠化，减少发动机部件的磨损，延长发动机寿命，提高发动机动力。是什么意思？

Lubrication system is mainly made to various parts of the engine specially effective lubrication to prevent excessive wear. In the General case, special car once in every 5000km-10000km, you need cleaning, in the face of excessive noise of the engine, accelerating weakness, also required cleaning time when water temperature is too high. Cleaning of sludge inside the engine and other sediments, avoid heavy oil under high temperature oxidation, reduce engine wear and tear parts, prolonging engine life, increasing engine power.