Like I said, take it to the guys at Cornes Toyota (it's only 5 minutes drive from Adelaide CBD)... They actually fixed the issue without me commenting on it... I knew it was happening but chose to ignore it as, like craig said, not too much coolant is actually lost and I'd seen it before in previous cars. But when I picked up the car the service manager said to me, we found a bit of coolant on the reserviour so looked at the cap and changed to one with with a better seal for you, and I was like, SWEET... I was going to ask about it, but seeing as they picked it up for me, no probs...