Mine seemed to use coolant too. I kept topping it up and it would go down the the same level about 2 centimetres below the low marker on the coolant resevoir. I was advised by a technician not to wprry about it and leave it to settle at it\´s own level. I thought he was talking rubbish but I have left it and it hasn\´t used any more coolant so it appears he was correct. 
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