I recently purchased this car and had a mechanical inspection report undertaken by MTA. The mechanic was concerned when the coolant appeared to be under pressure when the motor was stone cold so he undertook a C02 test and found no evidence of C02 in the coolant. I contacted the previous owner and she said that sometimes she had to add coolant if she went for a drive up into the Adelaide Hills. The motor runs fine, starts easily and the oil is still a nice reddish colour but I noticed again today after a 20min drive that the coolant was full to the top and overflowing a little. Has anyone else experienced this?