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When you change your radiator fluid I just drain my radiator and engine block and then I add the antifreeze. I USE TOYOTA ANTI FREEZE 2 GALLONS ALSO I MIX IN 2 GALLONS OF DISTILLED WATER MIXING IT 50/50 I END UP WITH 4 GALLONS AND I GO AHEAD AND FILL UP THE SYSTEM I DO THIS EVERY 2 YEARS. MY 91 LEXUS HAS THE ORGINAL HOSES--RADIATOR WITH 212,000 MILES AND NO PROBLEMS. THE PEOPLE AT LEXUS TOLD ME HOW TO DO THIS. I DO NOT FLUSH OUT MY SYSTEM DUE TO HARD WATER HERE IN CALIFORNIA JUST DRAIN AND FILL.