求翻译：Normal circumstances, the tanker driving 800km-1000km per cleaning and maintenance is required once, or when you find the engine breath shaking, hysteresis and speed up bad, black smoke, weakness, cleaning and maintenance costs when oil 1. Remove gum and carbon deposits within the system to prevent the occurrence of harmful corrosion, avoid and stop the leakage of seals and tanks, completely replacing the old coolant.是什么意思？

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