Our 58 plate tts roadster with 18k has been losing coolant at a rate of knots. Approx 5 litres in the past 2 weeks, on a daily round trip of 14 miles. Our local indie did a compression test and diagnosed a knackered head gasket. We contacted Audi, who have taken the car to the local stealers.. And the fun has begun! The audi technician is saying its not the head gasket, it's something else. What that something is is yet to be confirmed. can anyone suggest anything else it's likely to be. Something that causes the coolant loss, into the exhaust system, where it evaporates in clouds of steam.. I'm at my wits end now, with 2 completely different diagnosis.