hi all not been on here for a while, the car is a 51 reg 2.0 sport and its started using a little bit of coolant. it has 75000 miles on it. it will use up the header tank every 1000 miles or so but there is no excess pressure in the header to indicate head gasket or overheating issues, the inside mists up a fair bit which indicates the heater matrix but the carpets are bone dry. anyone else had this problem and what was the cause as i dont really want to start changing parts as a process of elimination cos you all know audi parts aint cheap lol. thanks in advance for any help