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Topping up coolant level

Car  306 GTI-6
Is it ok to buy some engine coolant from halfords and top up the level?

Just i had a look at it and it said on the bottle to drain and flush the system first, as using mixed manufacturers coolant isnt advisable.

Do i have to flush the system? or can i just whack some in?
 
What what I've read Halfords antifreeze is gycol based so mixing it with Renault antifreeze should be ok.
 
If its only that ammount you'll be fine to just top it up with water, it's only going to be 500ml at the absolute most.
 
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