i have recently had an oil leek on my engine, which was fixed under warranty, (i also just saw another post from another member with poss the same problem)
it is possible that the leek can cause a fire if the oil leeks on the exhaust manifold, the problem is the leek appears under the plastic engine cover so the only way you will see it is if you take the whole cover off, hence most people wont know till its to late
please check you engine, and remove your covers, check the link below for info
http://forum.cliosport.net/display_topic_threads.asp?ForumID=6&TopicID=146485&PagePosition=1link to the post