求翻译：常规情况下，油罐车每行驶800km-1000km时需清洗保养1次，或当你发觉引擎喘抖，迟滞和加速不良，冒黑烟，无力、费油时清洗保养1次。清除系统内部的胶质和积碳，防止有害的腐蚀发生，避免并制止密封件和水箱的渗漏，彻底更换旧的冷却液。是什么意思？

General case, the truck is required on each 800km-1000km cleaning 1 times, or when you discover that the engine surge shake, delays and poor acceleration, black smoke, weakness, when oil cleaning 1 times. Clear resin and carbon inside the system, preventing unwanted corrosion occurs, avoid and stem the leakage of seal and water tanks, completely replaced the old coolant.