So, I have been topping up with demineralised water for some time now and finally all my parts have arrived to replace the aux water pump, the expansion tank and cap and later the heater control valve. Now, I am thinking about the bmw coolant. When I pull all the pipes off I will loose some coolant which I suspect is just water now. Looking into the expansion tank all I see is clear water. Is there any harm in just pouring coolent directly in after the pipes are all connected again rather than pre mix? I am thinking that most of the existing is pretty diluted and probably no bmw coolent left at all and pouring it directly in will eventually mix with the existing? I live in a climate where it never gets below zero degrees. I have read that it may cause uneven heat exchange on cooling the engine and could cause problems. I was then at a later stage going to do a full flush.

cheers

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2005 X5 4.4i M Sport
2003 X5 4.4i