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they say to do it at 100k but sooner never hurt anybody. you can take it to the dealership for a full flush or you can drain the radiator and then remove the drain plug from the water pump and drain that. Then fill the system and blast the heat on high, while topping up when needed.
 

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roughly 8.4L but i just changed my water pump and thermostat and only put back in about 6L so buy a gallon of non pre mixed coolant and you'll have enough
 

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i used 4L of dasani lol
 
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